I have a 99 F-250 4x4 PSD. I am wanting to put a water tank in the back for the drought season to water flowers and shrubs. The tank will weigh 3000 lbs. full. I know that it is a 3/4 ton truck, but has any one ever put that much weight in the back of one? It's not like I will be driving around all the time with that much weight in the back of the truck. I know I will have to get some helper springs and go to 10 ply tires to handle the weight. I could put the tank on my open trailer, but it would be nice to always have it in the back, so I could pull my enclosed trailer at the same time.