CURT Class 3 Trailer Hitch Ball Mount, Fits 2-Inch Receiver, 7,500 lbs, 1-Inch Hole, 2-In Drop, 3/4-Inch Rise Model 45010CURT Class 3 Trailer Hitch Ball Mount, Fits 2 Inch Receiver, 7,500 lbs, 1 Inch Hole, 2 In Drop, 3 4 Inch Rise Model 45010 CURT class 3, or standard duty, Towing Accessories are a step up from classes 1 and 2. They feature a 2" x 2" shank and have a higher weight capacity for towing heavy duty trailers, including utility trailers, boat trailers, campers, single horse livestock trailers and most recreational vehicle trailers. With class 3 trailer