I just found a 1999 with 132,000 miles on it but it has a long wheel base. How much trouble is it to shorten the frame for a 10' long dump bed? It looks like it had an 18' box on it. The person that has it for sale hasn't gotten back to me on how much he wants for it. What would be a decent price on this truck. The frame has some rust scale on it but there is only one place on the cab that I noticed rust. Thanks in advance.