Place Super RV Jack Pads under stabilizing jacks and hydraulic levelers. Durable and strong, weight tested to 40,000 PSI. The Super Dolly Trailer Pad is tested to hold 100,000 PSI and is designed for tractor trailers and class A motor homes. Both styles protect against sinking into dirt, gravel and prevents damage to asphalt surfaces. Designed with built-in handle. 5 year Manufacturers warranty.