I've had my 1992 F800 now for just over a year now. It's a crew cab cab and chassis, 7.8L diesel, 9 spd Eaton-Fuller, rated at 33k GVWR. I plan to build a flatbed for it to haul my stretched CJ7 and tow my travel trailer. I am considering eventually installing air ride on the rear, probably a Kelderman system, to help soften the ride a little to take some of the stress off of the trailer tongue. There is no GCWR anywhere on the truck and VIN searches have come up negative as well. GVWR of travel trailer is 9500lbs, estimated weight of F800 is 15,000, and estimated weight of Jeep is 6,000. I am fairly confident that I am well within the safety margins of each GAWR, GVWR, and GCWR but how would I properly calculate a GCWR when the manufacturer didn't set one since it was sold as an in-complete vehicle? I'll post some pics when I can get around to it since I don't have a photobucket account yet. One of the first things I need to do is the 1g to 3g charging system conversion, tires, and flatbed design. Any shared knowledge is greatly appreciated.