Supporting up to 6 inches in height and 6,000 lbs(per block), this RV jack block is stackable and durable, ideal for Class A & C RVs and trailers. Use as a camper leveling block or trailer jack block to keep your vehicle steady on any terrain. Get ready for a smooth trip! | Vevor | | Trailer Jack Block, 6" High Heavy Duty RV Leveling Block with 6000 lbs Capacity, RV Jack Stand, Motorcycle Stand, Stool | Black | Best Buy