Check the listing for details. For Chevy K10 76-86 Trailer Hitch Class 5 Multi-Fit Square 7-1/2" Drop Trailer. Condition: New. Listed at 354.40 USD. Class 5 Multi-Fit Square 7-1/2" Drop Rear Trailer Hitch (15511) by CURT®. Color: Black. The Weight Carrying Capacity is 15000 lbs, while the Tongue Weight is 1500 lbs, 16000/1600 lbs Weight Capacity with use of Weight Distribution System, and the Receiver Tube Opening Size is 2". Features multiple mounting holes to fit a variety of vehicles. When CURT came to the limits of towing capacity, CURT wanted to know what else was out there. What could CURT discover off the beaten path? So, CURT kept going. CURT class 5 Xtra Duty hitches begin a class of their own, beyond class 4 and beyond anything the standards dictate. They are designed for the hard road where only 1/2-ton, 3/4-ton and 1-ton pickup trucks and SUVs dare to tread.