King Pin Hitch for Gooseneck: 5 Top Picks Compared

If you own a fifth-wheel trailer but want to tow with a gooseneck ball in your truck bed, a king pin hitch for gooseneck adapter is the solution. These adapters convert your fifth-wheel kingpin to a gooseneck ball, or vice versa, giving you flexibility without changing your entire hitch system.

This guide compares five top picks, from simple pin replacements to complete conversion kits, helping you choose the right one for your trailer and towing setup.

Misakomo Fifth Wheel to Gooseneck Adapter – Heavy-Duty Conversion

The Misakomo Fifth Wheel to Gooseneck Adapter is built with robust forged steel and one-piece machining for maximum strength. It features a 2-inch kingpin and a 2-5/16 inch gooseneck ball with a 3/5″ bolster, engineered for heavy-duty towing up to 30,000 lbs. The 8-inch diameter middle disc is optimized to handle dynamic forces during towing, providing stability and durability.

Installation is straightforward with a hassle-free bolt-on design. This adapter is specifically crafted for trailer fifth wheels, making it an excellent choice if you want to convert your fifth-wheel hitch to a gooseneck ball. The black finish adds a sleek look while protecting against corrosion.

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• Built to Last – The kingpin to gooseneck ball adapter is engineered with robust forged steel and precise one-piece machining for maximum strength and durability. This ensures a uniform distribution of force and a high resistance to breakage. It’s topped off with a protective coating for outstanding rust resistance, making it ideal for withstanding both severe weather and the test of time.
• Heavy-Duty Towing Capacity – This fifth wheel hitch adapter features a dependable 2-inch kingpin and a 2-5/16 inch gooseneck ball with a 3/5" bolster, engineered for maximum towing performance. It is capable of handling up to 30,000 lbs of gross trailer weight, perfect for securely transporting large fifth-wheel and gooseneck trailers.
• Precision Designed – Specially crafted for trailer-fifth wheels, the 5th wheel to gooseneck adapter's 8" diameter middle disc is optimized to better handle the dynamic forces during towing and reduce potential wobble, ensuring a stable and safe journey.
• Installation Made Simple – The 2085295 Gooseneck Ball Adapter offers a hassle-free installation, allowing for quick and secure attachment of your gooseneck or fifth wheel trailer to your truck, without the need for welding or extensive modifications. Simply adjust the main post of your gooseneck trailer as needed to ensure a level tow.
• Usage Guidelines – Ensure the fifth wheel is securely locked in an upright position to avoid tilting or unnecessary stress on the adapter. For trailers with an offset gooseneck, stabilize the fifth wheel plate to prevent articulation. Be cautious with pick-up type fifth wheels that swivel 360°, as they may not be compatible with this adapter.
• Verify Product Dimensions – Before making a purchase, please confirm the dimensions of this gooseneck ball adapter. Not all adapters are identical or share the same measurements. It is essential to verify that this adapter is compatible with your trailer and towing setup BEFORE PURCHASING to ensure a proper fit and avoid any compatibility issues.

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FlexHitch Gooseneck to 5th Wheel Adapter – Bolt-On Solution

The FlexHitch 30K Lbs GTW Gooseneck to 5th Wheel King Pin Adapter converts your gooseneck trailer’s 4″ round tube to a 2″ standard fifth-wheel kingpin. This eliminates the need to install a full gooseneck hitch system in your pickup. The heavy-duty carbon steel construction boasts a 30,000 lbs GTW and 4,500 lbs tongue weight rating, ensuring reliable towing for heavy loads.

Installation requires no welding, cutting, or professional modifications—simply replace the original gooseneck ball coupler on your trailer’s 4″ round tube with basic hand tools. The reinforced rib design adds strength, and you can keep your pickup’s fifth-wheel hitch intact while gaining the flexibility to tow gooseneck trailers.

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• Cost-Saving Compatibility Solution – No need to install a full gooseneck hitch system hitch for your pickup This adapter converts your gooseneck trailer’s 4" round tube to a 2" standard kingpin interface, letting your existing 5th-wheel hitch tow the trailer seamlessly
• Easy Bolt-On Installation – No welding, cutting, or professional modifications required! Replace the original gooseneck ball coupler on your trailer’s 4" round tube with basic hand tools in 15 minutes. Perfect for truck owners who prefer hassle-free at-home upgrades
• Heavy-Duty Load Capacity for Reliable Towing – Built with heavy duty carbon steel, this adapter boasts a 30,000 lbs GTW (Gross Trailer Weight) and 4,500 lbs tongue weight rating. Ideal for hauling heavy cargo, farm equipment, and construction materials without wobbling or failure
• Dual-Towing Flexibility Without Hitch Removal – Keep your pickup’s 5th-wheel hitch intact while gaining the ability to tow gooseneck trailers. Switch between 5th-wheel RVs and gooseneck flatbeds in minutes—no repeated uninstallation/installation, perfect for multi-purpose towing needs.
• Precision Fit for 4" Round Tube Trailers – Engineered with a tight 0.5mm gap tolerance to fit all standard 4" round tube gooseneck trailer frames. Eliminates towing noise and instability at high speeds, ensuring a secure, smooth ride whether on highways or rough off-road terrain

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GEN-Y Hitch Gooseneck Coupler Pin – Secure Replacement

The GEN-Y Hitch 3/4″ Gooseneck Coupler Pin is designed specifically for GEN-Y gooseneck couplers. It features a 3/4-inch diameter and 5.25-inch usable length, making it a direct replacement pin for your existing setup. The pin is constructed from high-quality stainless steel, offering excellent corrosion resistance and long-term durability in harsh weather conditions.

This pin includes a self-locking twist clip that ensures a secure fit, preventing accidental disconnection during towing. While it’s not a full conversion kit, it’s an essential component for anyone using a GEN-Y gooseneck coupler who needs a reliable replacement pin. The stainless steel finish also adds a polished look to your hitch setup.

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• Fits GEN-Y Gooseneck Couplers
• 3/4" x 5.25" Usable Length Gooseneck Coupler Pin
• Includes self-locking twist clip for secure fit
• Constructed of high quality stainless steel
• Made in the USA

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A-Premium Gooseneck Ball Adapter – Reliable & Affordable

The A-Premium Gooseneck Ball Adapter Hitch features a 2-inch king pin and a 2-5/16 inch machined ball, capable of towing trailers up to 30,000 pounds GVW. It is designed to fit tractor-trailer fifth wheels and undergoes harsh testing to ensure reliability. The reference numbers 2085295, BEC392, and others indicate compatibility with many standard fifth-wheel hitches.

Installation may require locking or blocking the fifth-wheel plate to prevent tilting, and you might need to adjust the gooseneck trailer’s main post for level travel. This adapter offers a cost-effective way to convert your fifth-wheel hitch to a gooseneck ball, making it a practical choice for budget-conscious users who need heavy-duty towing capability.

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• [Perfect Fitment]: The gooseneck ball adapter fits for tractor-trailer fifth wheels
• [Reference Number]: 2085295, BEC392, BE-C392, SUVC392, SUV-C392, EWC392, EW-C392 —This Gooseneck Ball Adapter undergoes harsh testing. Superior materials are utilized along with rigorous quality control standards to meet or exceed OE specifications.
• [Note]: You may need to lock or block the fifth wheel plate to prevent it from tilting. You may need to adjust the main post of the gooseneck trailer to keep the trailer traveling horizontally
• [Specification]: This gooseneck ball adapter trailer hitch is made up of a 2-5/16" machined ball and a 2" king pin that can tow trailers up to 30,000 pounds GVW.
• [Buy with Confidence]: A-Premium offers a one-year unlimited-mileage guarantee on our meticulously crafted trailer hitch. We offer a wide variety of automotive accessory categories, ensuring that you can hit the road with peace of mind.

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TOWGUARD Gooseneck to 5th Wheel Kit – Adjustable & Robust

The TOWGUARD Gooseneck Trailer to 5th Wheel King Pin Adapter Kit is a complete solution for 4-inch square tube gooseneck trailers. It includes the inner tube and features an adjustable multi-hole design that provides up to 6 inches of vertical adjustment. This helps you achieve a level towing setup, which is crucial for stability and even weight distribution when hauling heavy loads.

Built with a 30,000-lb capacity, this rigid steel kit is designed for flatbeds, heavy utility trailers, equipment hauling, and livestock trailers. The lower section features a reinforced gusset base with a lock pin for added security. This kit offers a more complete conversion compared to simple adapters, making it ideal for those who need adjustability and robust construction.

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• COMPLETE ADAPTER KIT FOR 4" SQUARE TUBE APPLICATIONS This kit includes the inner tube, creating a more complete gooseneck-to-fifth-wheel conversion solution. Designed for 4-inch square tube trailer applications and a standard 2" fifth wheel king pin hitch connection.
• HEIGHT ADJUSTABLE FOR LEVEL TOWING The adjustable multi-hole design provides up to 6 inches of vertical adjustment to help create a better level towing setup. Useful for matching different truck heights, trailer stances, and hauling conditions where towing balance matters.
• 30K LBS HEAVY-DUTY CAPACITY Built for demanding work with a 30,000-lb capacity, this rigid steel adapter kit is made for flatbeds, heavy utility trailers, equipment hauling, livestock trailers, agricultural towing, and other serious trailer applications.
• REINFORCED GUSSET BASE WITH LOCK PIN SECURITY The lower section features a reinforced gusset base to strengthen the king pin connection area, while the included lock pin adds a more complete retaining solution for users who want a more secure and ready-to-install setup.
• INCLUDES 2 FIFTH WHEEL HITCH LUBE PLATES Comes with 2 fifth wheel hitch lube plates to help reduce friction, lower grease mess, and minimize wear on the hitch contact surface. A practical addition for cleaner maintenance and repeated towing use.
• Professional Towing Guidance & After-Sales Support TOWGUARD provides towing setup recommendations, fitment assistance, and after-sales technical support. If you have questions regarding compatibility, towing configuration, or product coverage, please contact us at towguardsc@163.com. Our team is committed to delivering reliable support and product confidence.

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Buyer’s Guide: What to Consider

Choosing the right king pin hitch for gooseneck towing depends on your trailer type, hitch setup, and load requirements. Here are key factors to consider.

• Trailer Compatibility: Check if your trailer has a 4" round or square tube, or a fifth-wheel kingpin. Adapters are designed for specific configurations.
• Weight Capacity: Look for a 30,000 lbs GTW rating for heavy-duty towing of flatbeds, equipment, or livestock trailers. Ensure tongue weight capacity matches your needs.
• Height Adjustability: Some adapters offer multi-hole designs for up to 6 inches of vertical adjustment, helping you achieve a level towing position for better stability.
• Installation Method: Choose between bolt-on kits that require no welding or cutting, and simple pin replacements. Consider ease of installation and removal.
• Material & Build Quality: Forged steel or heavy-duty carbon steel with reinforced gussets provide long-lasting strength. Stainless steel pins resist corrosion.

Conclusion

Selecting the best king pin hitch for gooseneck towing comes down to your trailer’s tube type and your need for adjustability. For most fifth-wheel owners, the Misakomo or A-Premium adapters offer a straightforward conversion. If you have a gooseneck trailer with a 4″ round tube, the FlexHitch is a cost-effective bolt-on solution.

For square tube trailers, the TOWGUARD kit provides height adjustability for level towing. The GEN-Y Hitch pin is a simple replacement for existing GEN-Y couplers. Consider your specific setup and choose the adapter that best matches your towing needs.