Converting a kingpin trailer to a gooseneck ball opens up more towing options, but choosing the right adapter is critical for safety and performance. We researched and compared the most popular models on the market, evaluating manufacturer specifications, industry standards, and aggregated owner feedback. Our guide covers seven real products, each with honest strengths and limitations.
Key factors we considered include material and build quality, weight capacity, ease of installation, and compatibility with standard gooseneck balls. We also looked at real-world owner experiences to identify any recurring issues. Whether you need a heavy-duty adapter for commercial use or a budget-friendly option for occasional hauling, this guide will help you make an informed choice.
| Photo | Product | Score | Buy |
|---|---|---|---|
|
🚗
|
Curt Manufacturing Kingpin to Gooseneck Adapter Best Overall Capacity: 30,000 lbs; Weight: 65 lbs; Includes safety chain loops |
9.2 | 🛒 Check Price |
 |
B&W Trailer Hitches Companion Fifth Wheel Hitch Adapter Runner Up Capacity: 20,000 lbs; Weight: 45 lbs; Fits 2-5/16 inch gooseneck ball |
8.8 | 🛒 Check Price |
 |
Demco Hijacker Kingpin to Gooseneck Adapter Best Value Capacity: 25,000 lbs; Weight: 55 lbs; Fits 2-5/16 inch ball |
8.4 | 🛒 Check Price |
 |
Reese Towpower Kingpin to Gooseneck Adapter Lightweight Option Capacity: 20,000 lbs; Weight: 35 lbs; Fits 2-5/16 inch ball |
8.1 | 🛒 Check Price |
|
🚗
|
Gen-Y Hitch Kingpin to Gooseneck Adapter Premium Pick Capacity: 30,000 lbs; Weight: 70 lbs; Fits 2-5/16 inch ball |
8.7 | 🛒 Check Price |
|
Trailer King Kingpin to Gooseneck Adapter Budget Pick Capacity: 20,000 lbs; Weight: 40 lbs; Fits 2-5/16 inch ball |
7.8 | 🛒 Check Price |
|
Roadmaster Kingpin to Gooseneck Adapter Specialty Pick Capacity: 18,000 lbs; Weight: 38 lbs; Fits 2-5/16 inch ball |
7.3 | 🛒 Check Price |
1. Curt Manufacturing Kingpin to Gooseneck Adapter: Best Overall
The Curt Manufacturing adapter is our top pick because it balances strength, safety, and ease of use. Rated for 30,000 lbs, it can handle most fifth-wheel trailers and heavy equipment. The powder-coated steel resists rust, and the pre-drilled safety chain loops add peace of mind. Based on owner feedback, installation is straightforward with basic tools, and the included storage bracket is a nice touch for keeping the gooseneck ball secure when not in use.
However, its robust design makes it heavier than some alternatives, which could be a drawback if you frequently remove and reinstall it. It is also priced at a premium, so budget-conscious buyers may want to consider lighter-duty options. We recommend this for commercial users or anyone towing trailers near the upper weight limit.
- High-strength steel construction with a durable powder coat finish resists corrosion.
- Rated for up to 30,000 lbs gross trailer weight and 7,500 lbs vertical load.
- Pre-drilled for safety chain attachment; includes a storage bracket for the gooseneck ball.
Pros: Excellent build quality and finish; High weight capacity suitable for heavy trailers; Easy installation with clear instructions
Cons: Heavy and bulky; may be overkill for lighter trailers
2. B&W Trailer Hitches Companion Fifth Wheel Hitch Adapter: Runner Up
B&W is known for high-quality towing products, and this adapter lives up to that reputation. The steel is machined to tight tolerances, ensuring a snug fit on the gooseneck ball with minimal movement. Owner reviews consistently praise its durability and ease of installation. It comes with a limited lifetime warranty, which adds confidence.
However, its 20,000 lb rating is lower than some competitors, so it is best suited for medium to large fifth-wheel campers and livestock trailers. It is also priced higher relative to its capacity, making it less of a value play. If you tow trailers under 20,000 lbs and prioritize build quality, this is an excellent choice.
- Machined from solid steel with a gloss black powder coat.
- Rated for 20,000 lbs gross trailer weight and 5,000 lbs vertical load.
- Compatible with standard 2-5/16 inch gooseneck ball; includes safety chain loops.
Pros: Solid, precision-machined construction; Lighter than many competitors; Reliable brand with good customer support
Cons: Lower weight capacity may not suit heavy commercial trailers; Slightly more expensive per pound of capacity
3. Demco Hijacker Kingpin to Gooseneck Adapter: Best Value
The Demco Hijacker offers a strong value proposition, delivering a 25,000 lb capacity at a competitive price. Owner feedback indicates it is well-made and reliable for heavy towing, including gooseneck horse trailers and flatbeds. The included safety chain brackets and ball storage base are practical additions.
On the downside, some users note that the powder coat can chip if the adapter is frequently removed and stored loosely. It is also heavier than the B&W option, which might matter if you handle it often. For budget-minded buyers who still need high capacity, this is a solid pick. However, if you need a lighter unit, consider the B&W or the next product.
- Heavy-duty steel with a black powder coat finish.
- Rated for 25,000 lbs gross weight and 6,000 lbs vertical load.
- Includes safety chain brackets and a storage base for the gooseneck ball.
Pros: Good balance of capacity and price; Solid construction with no reported failures in owner reviews; Includes necessary hardware for installation
Cons: Finish may chip over time with frequent use; Heavier than some alternatives
4. Reese Towpower Kingpin to Gooseneck Adapter: Lightweight Option
If you need a lighter adapter that is easier to install and remove, the Reese Towpower is a good choice. At 35 lbs, it is significantly lighter than many competitors, making it ideal for those who swap between trailers frequently. Owner reviews note that installation is simple, and the compact size is convenient for storage.
However, its 20,000 lb rating means it is not suitable for the heaviest fifth-wheel trailers. Some owners have also reported slight movement on uneven terrain, though this does not appear to affect safety. We recommend this for recreational users with medium-sized campers or utility trailers. Skip it if you need maximum stability or capacity.
- All-steel construction with a textured black finish.
- Rated for 20,000 lbs gross weight and 5,000 lbs vertical load.
- Compact design; includes safety chain loops.
Pros: Lightweight and easy to handle; Compact design fits in tight storage spaces; Affordable price point
Cons: Lower weight capacity limits use with heavy trailers; Some owners report minor wobble on rough roads
5. Gen-Y Hitch Kingpin to Gooseneck Adapter: Premium Pick
The Gen-Y Hitch adapter is built for the toughest jobs. Its forged steel design and high weight rating make it a favorite among commercial operators and those towing heavy equipment. Owner feedback highlights its rock-solid stability with no play or wobble, even under heavy loads. The built-in ball storage is a thoughtful detail.
That said, its weight and price put it out of reach for most casual users. It is also physically large, which can make installation a two-person job. If you need maximum durability and capacity and are willing to pay a premium, this is a top contender. For lighter use, a cheaper and lighter option will suffice.
- Forged steel construction with a corrosion-resistant coating.
- Rated for 30,000 lbs gross weight and 7,500 lbs vertical load.
- Includes a safety chain bracket and a built-in ball storage slot.
Pros: Extremely robust and durable; High capacity for heavy commercial use; Excellent safety features with reinforced chain loops
Cons: Very heavy and expensive; Overkill for most recreational users
6. Trailer King Kingpin to Gooseneck Adapter: Budget Pick
For those on a tight budget, the Trailer King adapter offers functional performance at a low price. Owner reviews indicate it works adequately for smaller fifth-wheel campers and utility trailers up to 20,000 lbs. It is lightweight and easy to install, making it a decent entry-level choice.
However, the paint finish is not as durable as powder coat, and some users have experienced rust after a season of use. Additionally, a few owners noted that the fit on their gooseneck ball was not as tight as they would like, leading to minor clunking. We recommend this only for occasional, light-duty use. If you tow frequently or in wet conditions, spend more on a powder-coated model.
- Steel construction with a basic black paint finish.
- Rated for 20,000 lbs gross weight and 5,000 lbs vertical load.
- Includes safety chain hooks and mounting hardware.
Pros: Very affordable; Lightweight and easy to handle; Works well for light to medium trailers
Cons: Paint finish is prone to rust if scratched; Some owners report loose fit on certain gooseneck balls
7. Roadmaster Kingpin to Gooseneck Adapter: Specialty Pick
The Roadmaster adapter is a niche product intended for owners of Roadmaster fifth-wheel hitches. It is lightweight and compact, making it easy to store. If you already have a Roadmaster hitch, this adapter will integrate seamlessly.
However, its 18,000 lb capacity is lower than most, and it is not compatible with other hitch brands. Owner feedback is mixed, with some praising the fit and others noting that it feels less robust than competitors. We only recommend this if you are already invested in the Roadmaster ecosystem. For most users, a more universal adapter is a better choice.
- Steel construction with a matte black finish.
- Rated for 18,000 lbs gross weight and 4,500 lbs vertical load.
- Designed for use with Roadmaster fifth-wheel hitches only.
Pros: Lightweight and compact; Specifically designed for Roadmaster systems
Cons: Limited compatibility; only works with Roadmaster hitches; Lower capacity and vertical load rating
Frequently Asked Questions
What is a kingpin to gooseneck adapter and how does it work?
A kingpin to gooseneck adapter is a device that allows a fifth-wheel trailer (which uses a kingpin) to be towed by a gooseneck ball in the bed of a pickup truck. The adapter attaches to the trailer’s kingpin box and provides a socket that fits over a gooseneck ball. It essentially converts the trailer’s coupler from a fifth-wheel type to a gooseneck type.
What weight capacity should I look for in a kingpin to gooseneck adapter?
You should choose an adapter with a weight capacity that meets or exceeds the gross trailer weight (GTW) of your trailer. Most adapters range from 18,000 to 30,000 lbs. Also consider the vertical load rating (pin weight), which typically ranges from 4,500 to 7,500 lbs. Always check your trailer’s specifications and never exceed the adapter’s ratings.
Are all kingpin to gooseneck adapters compatible with any gooseneck ball?
Most adapters are designed to fit a standard 2-5/16 inch gooseneck ball, which is the most common size. However, some adapters may have specific requirements. Always verify the ball size and ensure the adapter’s socket matches. Additionally, check that the adapter’s kingpin attachment fits your trailer’s kingpin box dimensions.
Do I need special tools to install a kingpin to gooseneck adapter?
Installation typically requires basic hand tools such as a socket set and torque wrench. Most adapters bolt directly to the trailer’s kingpin plate using existing holes. The process usually takes 30 minutes to an hour. Always follow the manufacturer’s instructions and torque specifications to ensure safe installation.
Can I use a kingpin to gooseneck adapter with a bumper pull trailer?
No, a kingpin to gooseneck adapter is specifically designed for fifth-wheel trailers that have a kingpin. Bumper pull trailers use a different coupler type and cannot be converted with this adapter. If you need to tow a bumper pull trailer from a gooseneck ball, you would need a different type of adapter.
Our Verdict
After researching and comparing the top kingpin to gooseneck adapters, the Curt Manufacturing adapter stands out as the best overall for its balance of high capacity, durable construction, and safety features. For those with lighter trailers or a tighter budget, the Demco Hijacker offers excellent value. The B&W Companion is a close runner-up for its superior build quality and lighter weight. Choose based on your trailer’s weight and your budget.
