Best Kingpin Adapter For Gooseneck Trailer

#1 · Best Overall

1. springcraze SC31

• Material: Alloy Steel
• Compatible with Vehicle Type: Tractor, Trailer, RV

Best for: Rated adapter with anti-tilt washers.

Why it ranks #1: Specifies a 2-inch kingpin, 2-5/16-inch ball, 30,000-pound capacity, and four anti-tilt PU washers for a well-detailed conventional conversion.

A stated 30,000-pound gross vehicle weight capacity paired with four anti-tilt PU washers makes springcraze SC31 a fit for buyers seeking a rated conversion with added stability accessories. Its 2-inch kingpin and 2-5/16-inch gooseneck-ball dimensions define the connection points.

The forged alloy-steel body is specified for towing up to 30,000 pounds GVW, giving buyers a published capacity alongside a robust material. Its 2-inch kingpin and 2-5/16-inch ball sizes make the intended interface clear for fit planning. Powder coating and phosphate treatment are listed for resistance to salt spray, rain, and temperature shock, which matters for exposed towing conditions. Four anti-tilt PU washers provide the included stability accessory without requiring buyers to source that component separately.

Skip it if you need a raised base for additional ground clearance; springcraze SC32U specifies a 1.5-inch lift design.

SC31 suits buyers whose setup matches its 2-inch kingpin and 2-5/16-inch ball and who want a stated 30,000-pound capacity plus anti-tilt washers. Choose another configuration if a raised base is needed for ground clearance.

Listed on Amazon as: Kingpin to Gooseneck Ball Adapter – 2-5/16'' Fifth Wheel Gooseneck Ball Hitch Adapter, Fit for Tractor or Trailer Fifth Wheels, Load Capacity 30,000 lbs,Replace #2085295 with 4 PU Washer

#2 · Best Raised Design

2. springcraze SC32U

• Compatible with Vehicle Type: Truck
• Weight: 8 lb

Best for: Raised-base clearance option.

Why it ranks #2: Lists the same 30,000-pound capacity and standard 2-inch kingpin and 2-5/16-inch ball, with a 1.5-inch lift and included lube plate.

A 1.5-inch lift base is springcraze SC32U’s defining feature, giving buyers a raised adapter profile for towing scenarios where extra ground clearance is useful. The listing also states a 30,000-pound capacity, 2-inch kingpin, 2-5/16-inch ball, and included anti-tilt PU washer and lube plate.

The 1.5-inch lift base increases ground clearance, which can help accommodate towing scenarios where the standard-height arrangement is unsuitable. The forged alloy-steel adapter is rated at 30,000 pounds GVW and uses a 2-inch kingpin with a 2-5/16-inch ball, giving buyers both a load figure and interface dimensions for checking a setup. Powder coating and phosphate are specified for environmental resistance. An anti-tilt PU washer and fifth-wheel lube plate are included for the connection and contact surfaces.

Skip it if you want a non-raised adapter profile; springcraze SC31 lists the same ball size and capacity without a stated lift base.

SC32U fits buyers needing extra ground clearance from a 1.5-inch raised base while retaining a stated 30,000-pound capacity and specified ball interface. The lift changes the adapter height, so it is not the right profile for every trailer arrangement.

Listed on Amazon as: Kingpin to Gooseneck Ball Adapter 1.5" Raised Reinforced Rib for 2-5/16'' Fifth Wheel Gooseneck Ball Hitch Adapter, Anti-tilt PU Washer and 5th Wheel Lube Plate Included

#3 · Highest Capacity

3. Sidasu 30,000-pound Adapter

• Material: Alloy Steel
• Compatible with Vehicle Type: Tractor, Truck
• Weight: 30 lb

Best for: Rated heavy-load conversion.

Why it ranks #3: Its title and features state a 30,000-pound load capacity, and the listing identifies alloy steel with a black waterproof powder finish.

A listed 30,000-pound load capacity sets the Sidasu adapter apart for buyers converting between fifth-wheel and gooseneck towing who need a stated load figure. Its alloy-steel construction and black waterproof powder finish add material and weather-protection details for trailer and truck use.

Sidasu specifies alloy steel and a black waterproof powder finish, pairing a durable material with a surface treatment intended to resist rust and wear in harsh weather. The stated 30,000-pound capacity gives buyers a concrete load figure for evaluating a towing setup. Its listed purpose includes connecting a trailer with a 2-inch gooseneck hitch ball to a standard-sized fifth-wheel truck. That defined interface and load figure help narrow compatibility checks before changing trailer configurations.

Skip it if you need a stated 2-5/16-inch ball interface; springcraze SC31 specifies that size alongside a 30,000-pound capacity.

Sidasu fits buyers who need a stated 30,000-pound capacity and the specified 2-inch gooseneck-ball-to-fifth-wheel-truck conversion. Check that its stated interface matches your hitch; it does not list the 2-5/16-inch ball size found on some adapters.

Listed on Amazon as: 5th Wheel to Gooseneck Adapter,30,000lbs Large Load Capacity

#4

4. Misakomo Kingpin Adapter

• Material: Alloy Steel
• Compatible with Vehicle Type: Truck, Tractor, Trailer

Best for: Forged-steel towing adapter.

Why it ranks #4: Lists a 2-inch kingpin and 2-5/16-inch ball, with one-piece forged-steel construction and a protective coating, but gives no capacity figure.

One-piece machined forged steel is the defining feature of Misakomo’s kingpin-to-gooseneck adapter, giving buyers a solid-steel connection for converting a fifth-wheel setup to a gooseneck ball. Its specified 2-inch kingpin and 2-5/16-inch ball size identify the interfaces it is made to connect.

The one-piece machining and forged alloy-steel construction are intended to distribute force evenly, a practical feature for buyers seeking a solid adapter rather than a multi-piece connection. A protective coating is specified for rust resistance in severe weather, helping address exposure during towing and storage. The stated 2-inch kingpin and 2-5/16-inch gooseneck ball dimensions define the mating points; the listing does not provide a load rating, so capacity-based selection needs other verified information.

Skip it if you need a stated 30,000-pound rating; springcraze SC31 lists that capacity along with its ball and kingpin sizes.

Misakomo suits a buyer converting a compatible fifth-wheel kingpin to a 2-5/16-inch gooseneck ball and valuing forged, coated steel. Its listing does not state a capacity, so it is not the pick when a published load rating is essential.

Listed on Amazon as: Fifth Wheel to Gooseneck Adapter, Kingpin to Gooseneck Ball Hitch Adapter

#5

5. FlexHitch KA-01

• Material: Alloy Steel
• Compatible with Vehicle Type: Pickup Trucks
• Weight: 14.5 lb

Best for: Pickup-truck conversion adapter.

Why it ranks #5: Explicitly describes converting a truck fifth-wheel hitch for gooseneck towing and lists alloy steel, though no capacity or fit dimensions are supplied.

Pickup-truck compatibility is the clearest use-case detail for FlexHitch’s adapter, which converts a fifth-wheel hitch for gooseneck towing. Its title specifies a 2-5/16-inch gooseneck ball, while the alloy-steel material and listed 14.5-pound weight give additional details for planning fit and handling.

FlexHitch’s title states the intended workflow: convert a pickup truck’s fifth-wheel hitch for gooseneck towing through a kingpin-to-2-5/16-inch-ball adapter. That ball size helps buyers check the receiving interface, and the pickup-truck compatibility narrows its stated vehicle use. Alloy steel is the listed material. At 14.5 pounds, the stated item weight gives a concrete handling detail for storage or installation planning; the supplied specifications do not provide a load rating.

Skip it if you need a published 30,000-pound rating; Sidasu C02DWLEJSPQ0001 lists that capacity for its adapter.

FlexHitch fits pickup-truck owners converting a fifth-wheel hitch to gooseneck towing when its 2-5/16-inch ball interface matches the setup. The supplied facts omit a capacity figure, which matters when selecting an adapter by load rating.

Listed on Amazon as: Fifth Wheel to Gooseneck Adapter, Kingpin to 2-5/16 Inch Gooseneck Ball, Converts Your Truck 5th Wheel Hitch for Gooseneck Towing

#6

6. VIRTIONZ Ball Adapter

• Material: Alloy Steel
• Compatible with Vehicle Type: Tractor, Trailer

Best for: Basic alloy-steel ball adapter.

Why it ranks #6: Its title specifies a 2-5/16-inch gooseneck ball receiver adapter, and specifications list alloy steel, but capacity and kingpin size are absent.

VIRTIONZ specifies a 2-5/16-inch gooseneck-ball adapter for a fifth-wheel kingpin, making the intended conversion clear for buyers checking those two interfaces. Its alloy-steel construction and stated compatibility with tractors and trailers provide the limited but concrete material and vehicle details in the listing.

The title identifies a fifth-wheel kingpin connection and a 2-5/16-inch gooseneck ball, helping buyers assess the adapter against the hitch components already in their setup. Alloy steel is the listed material, and compatibility is specified for tractors and trailers. These details support a basic interface and vehicle check before installation. The supplied specifications provide no capacity figure or installation procedure, so buyers seeking a load-rated selection or a documented changeover workflow will need more product information.

Skip it if you need a stated 30,000-pound capacity; springcraze SC31 lists that rating with the same 2-5/16-inch ball size.

VIRTIONZ suits buyers whose tractor or trailer setup needs a fifth-wheel kingpin-to-2-5/16-inch-ball adapter and who can evaluate capacity separately. Its listing gives the interface and material but no stated towing-capacity figure.

Listed on Amazon as: Fifth Wheel Kingpin Gooseneck Ball Adapter for 2-5/16 Inch Gooseneck Ball Towing Receiver Adapter

#7

7. MARKETTY Ball Adapter

• Material: Alloy Steel
• Compatible with Vehicle Type: Trailer, Truck
• Weight: 7.86 kg

Best for: Straightforward ball conversion.

Why it ranks #7: The title identifies a fifth-wheel kingpin-to-2-5/16-inch gooseneck ball adapter; specifications list alloy steel but omit capacity and detailed fit information.

The stated 2-5/16-inch gooseneck-ball connection is the key fit detail on MARKETTY’s adapter, which converts a fifth-wheel kingpin interface for gooseneck-ball towing. Its alloy-steel construction and 7.86-kilogram listed weight give buyers basic material and handling information when comparing a simple adapter option.

This adapter’s title identifies the two sides of the conversion: a fifth-wheel kingpin and a 2-5/16-inch gooseneck ball. That helps buyers determine whether it matches their intended hitch interface before planning a changeover. The alloy-steel specification identifies its material, while the listed 7.86-kilogram weight gives a concrete expectation for handling and storage. The supplied product facts do not state a load rating or installation steps, so this is not a capacity-led choice.

Skip it if you require a stated 30,000-pound capacity; Sidasu C02DWLEJSPQ0001 lists that load figure for its adapter.

Choose MARKETTY when the 2-5/16-inch ball interface and alloy-steel construction match your setup and you want a basic conversion adapter. Its supplied facts omit a capacity figure, making it a poor match when load-rated selection is required.

Listed on Amazon as: Gooseneck Ball Adapter – Fifth Wheel Kingpin to 2-5/16 Inch Gooseneck Ball Towing Receiver Adapter -Black

#8

8. Wallace Forge Adapter

• Material: Alloy Steel
• Compatible with Vehicle Type: Trailer
• Weight: 32 lb

Best for: U.S.-made alloy-steel adapter.

Why it ranks #8: The listing identifies a gooseneck-to-kingpin adapter, a reverse conversion for this search, and supplies alloy steel and 32-pound item weight.

Wallace Forge identifies this adapter as made in the U.S.A., a concrete origin detail for buyers selecting a gooseneck-to-kingpin conversion. Its listing also specifies alloy steel and a 32-pound weight, giving shoppers two useful material and handling facts even though the supplied information is brief.

The title describes a gooseneck-to-kingpin adapter, so its conversion direction is central when deciding whether it suits a trailer and hitch combination. Alloy steel is the listed material, while the 32-pound item weight gives buyers a practical sense of handling during installation or storage. The U.S.-made designation is another specific product detail. The supplied specifications do not include ball dimensions or a load rating, so buyers cannot use those figures to confirm interface or capacity from this listing alone.

Skip it if you need a listed 30,000-pound capacity; Sidasu C02DWLEJSPQ0001 gives a specific load figure for its adapter.

Wallace Forge is for buyers seeking a gooseneck-to-kingpin adapter who value its listed alloy-steel construction and U.S. origin. Its sparse specifications leave ball dimensions and capacity unstated, so those details must be established before choosing it for a specific setup.

Listed on Amazon as: Wallace Forge Gooseneck to Kingpin Adapter – Made in U.S.A

#9

9. EXODIOS Round-Tube Adapter

• Material: Alloy Steel
• Compatible with Vehicle Type: Tractor, Trailer, RV

Best for: Four-inch tube conversion.

Why it ranks #9: Its listed compatibility requires a 4-inch round tube and 2-inch kingpin, but the description focuses on gooseneck-to-fifth-wheel conversion rather than the searched direction.

Compatibility with a 4-inch round tube and 2-inch kingpin defines EXODIOS’s conversion adapter, giving buyers specific trailer-side fit criteria to check. Its stated applications include semi-tractors, campers, trailers, and tractors, while the alloy-steel construction supports a range of towing configurations.

The 4-inch round-tube and 2-inch-kingpin requirements narrow the setups this adapter is intended to fit, helping buyers check the trailer connection before planning a changeover. EXODIOS lists use with semi-tractors, campers, trailers, and tractors, which makes its stated vehicle range broader than a pickup-only listing. Alloy steel is the specified material. The product description also identifies increased turning and maneuverability as an advantage, but the supplied facts give no numerical turning or load figures.

Skip it if you need a stated 30,000-pound capacity and 2-5/16-inch ball; springcraze SC31 specifies both details.

EXODIOS is for buyers whose trailer has the specified 4-inch round tube and 2-inch kingpin and who value its listed broad vehicle applications. Its fit depends on those interfaces, and the supplied facts do not state a capacity rating.

Listed on Amazon as: Fifth Wheel to Gooseneck Hitch Adapter with 4" Round Tube 2"

#10

10. Hezaosth Pop-Up Adapter

• Material: High Strength Carbon Steel
• Compatible with Vehicle Type: Tractor, Truck

Best for: Switchable coupler setup.

Why it ranks #10: Describes a gooseneck-to-fifth-wheel conversion using a 4-inch round tube, so it does not serve the searched kingpin-to-gooseneck direction.

A slide-down coupler and separate main-pin adapter make Hezaosth’s product a conversion option for buyers who want to switch trailer types using a sleeve-based setup. The stated 4-inch round gooseneck coupler size and compatibility with semi-trailer tractors or pickup trucks with fifth wheels define its intended fit.

The listed changeover process slides the heavy-duty wall-tube coupler down from the neck’s outer clamping sleeve, then secures the SAE-standard main-pin adapter in that sleeve. This sequence gives buyers a specific workflow for switching trailer types rather than a fixed ball-adapter format. The 4-inch round coupler size and stated suitability for semi-trailer tractors or fifth-wheel pickup trucks help narrow fit checks. High-strength carbon steel and the rust-proof upgrade address material and weather exposure.

Skip it if you need a direct 2-5/16-inch ball adapter; springcraze SC31 lists that ball size and a 2-inch kingpin.

Hezaosth suits buyers needing a sleeve-based switch between trailer types, especially where the 4-inch round coupler tube and described main-pin workflow match. It is not the direct choice for a setup that specifically requires a 2-5/16-inch ball adapter.

Listed on Amazon as: Gooseneck to 5th Wheel Adapter/Pop-Up Gooseneck Trailer Hitch King Pin