For many truck owners, towing is a part of everyday life. Whether hauling a camper, livestock trailer, or heavy equipment, the right hitch setup makes all the difference in safety, performance, and convenience. One question that often arises is how to tow a 5th wheel trailer when your truck is already equipped with a gooseneck hitch. The solution? A 5th wheel gooseneck adapter—a simple yet highly effective tool that allows for compatibility between two distinct towing systems.

What Is a 5th Wheel Gooseneck Adapter?

A 5th wheel gooseneck adapter is a specialized towing device that enables a truck with a gooseneck hitch to tow a 5th wheel trailer. Normally, a 5th wheel trailer connects to a large hitch mounted over the rear axle of a truck, using a kingpin and locking jaws system. A gooseneck trailer, on the other hand, connects using a ball-and-coupler system.

Because the two hitch styles are mechanically different, a 5th wheel gooseneck adapter serves as the link between them. It connects to the trailer’s kingpin and extends downward to latch onto the gooseneck ball in the truck bed. This clever connection allows truck owners to tow 5th wheel trailers without needing to remove or replace their existing gooseneck setup.

Why Use a 5th Wheel Gooseneck Adapter?

There are several reasons truck owners turn to adapters rather than installing a separate 5th wheel hitch:

• Versatility: Many truck owners tow multiple trailer types—some gooseneck, some 5th wheel. An adapter lets you handle both without switching hitches.
• Convenience: Installing or removing a 5th wheel hitch can be heavy, time-consuming, and requires additional mounting rails. A gooseneck adapter provides a faster, simpler option.
• Cost Efficiency: Purchasing an adapter is typically far less expensive than buying and installing a full 5th wheel hitch system.
• Truck Bed Space: Gooseneck hitches are generally more compact, leaving the bed free for other use when not towing.

For drivers who want the flexibility to switch between different trailer styles, a gooseneck adapter offers the perfect balance of convenience and cost-effectiveness.

How a Gooseneck Adapter Works

The core function of a 5th wheel gooseneck adapter is to bridge the design gap between a 5th wheel trailer’s kingpin and a truck’s gooseneck ball. The upper portion of the adapter locks securely onto the kingpin, while the lower end features a coupler that fits over the gooseneck ball.

Once connected, the adapter maintains the necessary pivot point for safe cornering and stable towing. Most models also allow height adjustment, ensuring that the trailer remains level while in motion—a critical factor for both safety and performance.

Types of 5th Wheel Gooseneck Adapters

There are two main types of adapters available on the market today, each suited for different needs and budgets.

1. Kingpin-to-Gooseneck Tube Adapters

This type of adapter attaches directly to the trailer’s existing kingpin. It extends downward to the truck bed, where it couples with the gooseneck ball.

Advantages:

• Easy to install or remove as needed
• Adjustable for different truck bed heights
• Cost-effective and widely available

Considerations:

• May add additional leverage to the trailer’s frame due to the increased distance between the kingpin and hitch point
• Not always recommended for long-term or heavy-duty use

This style is best for occasional towing or for truck owners who need a quick, flexible solution.

2. Replacement Gooseneck Pin Boxes

Instead of attaching an external adapter, this option replaces the entire pin box on the 5th wheel trailer with a new unit designed for gooseneck towing.

Advantages:

• Provides the most secure and durable connection
• Reduces frame stress by maintaining proper towing geometry
• Often includes cushioning or shock absorption for a smoother ride

Considerations:

• More expensive than bolt-on adapters
• Installation requires removing the old pin box, which may require professional assistance

Replacement pin boxes are the preferred choice for those who tow frequently or carry heavy loads. They provide long-term reliability and protect the integrity of the trailer.

Important Safety and Compatibility Tips

Before purchasing or installing a 5th wheel gooseneck adapter, it’s essential to keep safety and compatibility in mind:

• Check the Trailer Manufacturer’s Warranty: Some trailer manufacturers specifically advise against using adapters, as the altered towing geometry can increase frame stress. Always verify compatibility before installation.
• Match the Weight Rating: Ensure that the adapter’s Gross Trailer Weight (GTW) and Pin Weight (PW) ratings meet or exceed the trailer’s requirements.
• Proper Height Adjustment: The adapter must be adjusted so that the trailer rides level behind the truck. An uneven setup can lead to handling issues and tire wear.
• Use Quality Equipment: Cheap or poorly designed adapters can lead to dangerous towing conditions. Choose a trusted brand with proven performance and safety certifications.

The Bottom Line

A 5th wheel gooseneck adapter is an innovative solution for anyone looking to maximize towing versatility. Whether you’re an RV enthusiast, a rancher hauling livestock, or a contractor transporting equipment, this adapter allows you to safely tow a 5th wheel trailer using your existing gooseneck setup.

When chosen and installed properly, it offers the convenience of a dual-purpose towing system—without sacrificing safety or performance. As with any towing component, always follow the manufacturer’s guidelines and ensure all parts are properly rated for your specific load.

With the right 5th wheel gooseneck adapter, you can enjoy smoother towing, easier setup, and the freedom to handle whatever the road ahead demands.