I might be in the market for a truck in a couple of months. The problem is that I will need a longer wheelbase than is offered in a 3500 but I don't necessarily need the added suspension, weight, height, etc. of a 4500 or larger truck. We are currently running all Dodges and 3 of them have stretched frames with the longest fitted with a 20ft box. The question I have is will lengthening the frame to fit our needs void any and all warranties on the truck? Would they say, "your engine failed because of the extra load the truck was carrying and the truck was not designed for that." Or am I going to have to go with a 4500 or Freightliner or International with the proper frame length?