This 2-piece set supports up to 6 inches in height and 6,000 lbs per block. These RV jack blocks are stackable and tough, ideal for Class A & C RVs and trailers. Works as a trailer leveling block or camper jack block to ensure stable, secure parking. Don’t let uneven ground spoil your trip! | Vevor | | Trailer Jack Blocks, 6" High Heavy Duty RV Leveling Blocks, Each with 6000 lbs Capacity, as RV Jack Stand, Stool, Camper | Black | Best Buy