1998 Western Star with a 20 foot steel box. I set it up so in an hour it can have the plate back on and pull trailers. The box is a 20 foot steel box that we added a hydraulic tailgate to a couple years ago. Bought the parts from Aulick and welded them on so it works really nice. 30 ton hoist. 3 grain gates and latch for the tailgate, we don't ever bolt it shut. It almost entirely cleans out from the 3 grain gates, then open the tailgate for the last tiny bit. 6 bolts and 2 pins hold the box on, remove those and 3 hoses and stick forks under it to remove. Plate is a sliding type and the bottom stays on the truck, so set the plate on and slide it back. Easy. Truck has a 13 speed and 435/500 detroit in it.