Heavy duty Riser Ramps. Aluminum construction with the pair rated at 30,000 lbs and virtually indestructible. Will make many box trucks and vehicles which are not quite dock-high compatible at most any dock in the nation by adding one half foot of additional height in the rear. Simply back up on them, drop the dock plate and start rolling the pallets on board. These ramps were used with a 14ft Ford E350 box truck and worked great over the last 3 years. Originally cost over $800 new (with shipping). $250 cash only takes them. No shipping-local only. Pickup locale is basically St. Louis, MO. Please email me with any inquiries. Thanks.