What Size Channel Does My Trailer Coupler Have?

Updated 12/15/2025 | Published 11/12/2024

Question:

Instructions for ordering correct coupler latch says to measure width of channel. Can you provide a diagram or photo of where to exactly measure the channel, and what/where is “the channel” ? I have an A frame coupler that is standard factory issue on my Casita 17’ travel trailer. Thanks in advance…

asked by: Gary P

Helpful Expert Reply:

Hello Gary.

The channel width would be the width of the frame that the coupler installs on. I am attaching an image of the Bulldog Collar-Lok Coupler w/ Pin # BD028243 so you can see what measurement they are referencing. In the image provided this one would be a 3" channel because that is the inside to inside measurement.

I have also included a link the all the coupler latch repair kits that we offer.

expert reply by: Kate F

Trailer Coupler Measurements
(click to enlarge)

Kate F.

12/15/2025

Hey Gary, did the image of the Bulldog coupler help you see where to measure the channel on your Casita’s A-frame coupler? Knowing how that measurement worked out could help others trying to match their latch repair kit.