Link Manufacturing LB20 Spring Assisted Loading Ramp Rear or Side Door Mount 1500 Pound Capacity Model LB20 36 108 Ford E Series All CURT loaded ball mounts Headache Rack Rear Ladder Rack Gull Wing Box Options:Gull Wing Box W Post Headache Rack Only All CURT loaded ball mounts feature 2" x 2" sh anks and are made with the same superior quality we put into each of our products These redesigned Outlaw Running Boards are a superior upgr ade from previous Outlaw Nerf Step Bar designs that lacked rock rails and utilize a sleek single tube design that provides double thick durability Each unit features a low profile transition threshold at the top to ensure a smooth approach for equipment Quick Release Operation: Sturdy hinge points and quick release latches enable the ramp to be unfolded or stowed in just a few seconds