It depends on how good you are at managing your money. If you have a good healthy maintenance/emergency fund and you maintain the truck properly, then you could go for ever. If you're lousy with your money and don't take care of the truck then I would trade it in every three years on a new one.
A friend had a 96 FLD w/ CAT 435 1.6 million miles before an inframe. He took care of it, got it up to 2.2 mil before he died at the wheel.
Another had a 99 Century w/ Cummins N14 525 800,000 miles and it was completely trashed. Drove the heck out of it, didn't take care of it. The head gasket went, opened it up, everything was worn out. The king pins were worn out, rear suspension shot, on and on.
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