i was doing some truck shopping this morning and found a 1999 ford f350 for sale on craigslist. The truck has 84k miles and is a single cab. it also has a plow and spreader. the only problem it has is the drive side door has rust and needs replacing. The truck seems like a good truck, the problem im having is that since it way a plow truck all its life, what do you think the undercarrage is like? should i be worried about that? The best part about this truck is that hes only asking $850 if it turns out to be a clunker, i could alwyas use it as a parts car for another one of my f350. what do you guys think?