Today were going to take a quick look at the Atwood A-frame under mount trailer Coupler part number 82680. Now this coupler is an under mount design. Its designed to sit on the bottom of youre a-frame trailer. Youll fit it to the bottom and then weld along these edges against your trailer frame. Theres a hole here cut for the jack as well as a hole down here and threaded holes for the bolts. … see more >