My truck weighed about 7000 lbs on the rear axle with just the camper and closer to 8000 lbs with the trailer hitch on the rear. If the F250 is 2005 or newer, it has better brakes, frame and suspension than previous years. If the truck already has 18" or 20" OEM wheels and the camper package, it will need a rubber cargo mat, camper tie downs, turnbuckles and upper and lower StableLoads to just carry the camper. To be able to tow a heavy trailer behind that, you also need the SuperHitch Receiver, SuperTruss extension, heavier dampened shocks, air bags or additional springs and 19.5" tires and rims. The rest of the truck can handle the load, but you have to put about $4k in upgrades to make it safe and handle well. If your friend does not want to put so much into his truck, he needs to sell it and buy a DRW truck - There is no going around either spending money to upgrade select truck components or the entire truck.