Prevents costly damage to your RV or trailer frame, bumper, and plumbing by contacting the ground before your rig drags or digs in. Wheels pivot with the terrain to reduce stress on your frame and maximize protection when crossing dips, curbs, or steep driveways. Superior to standard casters, these skid wheels are engineered to withstand repeated ground contact and deliver long lasting durability. Includes roller bearings for smooth operation plus a ¼" urethane outer edge for added grip, wear resistance, and quiet rolling. Compact 5” wheel diameter / 7.25" installed height makes them ideal for Class C motorhomes and trailers up to 34' long. 2/pack.