Class 3 Ball Mount Imported (2" Shank 7 500 Lbs. 4" Drop 8-1/4" Long)CURT class 3, or standard duty, ball mounts 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 hitches being the most common type of trailer hitch for pickup trucks and SUVs, the class 3 ball mount, by association, is an excellent