CURT 25227 Heavy Duty Black A-Frame Trailer Coupler, 2-5/16-Inch Hitch Ball, 12,500 lbs. If you are replacing a broken coupler on your trailer or installing a new one on a trailer you are building, Selecting the right trailer hitch, ball mount and trailer ball to manage the weight of your trailer is not the only important aspect of towing; you also need a trailer that can stand up to the road ahead. That means equipping it with a coupler that is built to go the distance. A-frame couplers are meant to mount onto trailers with an A-shaped tongue. They are stronger than straight-tongue couplers and are especially common on RV trailers. This particular A-frame coupler features a sleeve-lock latch and a solid neck for increased strength and security. It is made from hardy steel construction and has a durable carbide black finish to protect from corrosion, wear and tear. A-frame sleeve-lock coupler features a gross trailer weight capacity of 12,500 lbs.