Curt MFG. Towing Trainler Posi - Lock Coupler. For secure connections while you travel, grab a Posi-Lock Coupler! Features a lockable latch for peace of mind on the road. Durable zinc finish to keep it lookin" good for years! Comes with manufacturer"s 3-year warranty. State Size. Buy yours now! Tongue Load (lbs.): 500; Gross Load (lbs.): 3,500; Description: 2" Ball, 2" Channel; Dimensions, Weight: 12 x 4 x 4", 4 lbs.; Tongue Load (lbs.): 500; Gross Load (lbs.): 3,500; Description: 2" Ball, 2-1/2" Channel; Dimensions, Weight: 11 x 4 x 5", 4 lbs.; Tongue Load (lbs.): 500; Gross Load (lbs.): 3,500; Description: 2" Ball, 3" Channel; Dimensions, Weight: 11 x 5 x 5", 4 lbs.; Curt MFG. 3,500-lb. Towing Trailer Posi-Lock Coupler