A coupler is welded or bolted to the front of your trailer frame. It mates with the trailer ball for a secure swiveling connection. How to choose a trailer coupler isn’t rocket science. Here’s a 4-step guide to get you underway.

Step 1: Select the Correct Size of Trailer Ball

Ball couplers are available in several sizes. There are four US standard sizes:

• 1 7/8 inches
• 2 inches (aka 50mm)
• 2 5/16 inches
• 3 inches (gooseneck only)

2” and 2-5/16” are the two most common sizes for conventional trailering. 1-⅞” is reserved for light-duty trailers, like kayak trailers and motorcycle trailers.