Let me touch back base here and see what you guys have to say. Haven't found many 6.0 trucks on the market right at the moment and I've been doing more homework on Duramax trucks the more I go along.
$20,000 is around my budget price for right now. Around here for that I'm finding Duramax truck 06-07.5 usually have 160k-190k miles and up. Then 08-10 usually little over budget with 180k-300k I've just been watching trying to see where things go for now. Haven't decided if it's better if I did get a Duramax to have an older truck lower miles or newer truck higher miles
I've seen lly trucks 04.5-05 kinda all over the board and for cheaper prices but I think I better off to stay away from them. Plus I would really like to have the six speed Allison
At 200k miles any of the major mechanical systems on any truck can fail at any time, even if properly maintained. Now compound that with the fact that many of these vehicles are not
properly maintained, throw on a 10k+ lb trailer for a significant fraction of the vehicle's mileage, possibly some tuning (running engine out of spec), and you're nicely set up for catastrophe.
Personally, I'd suck-start an AR-15 before dropping twenty thousand dollars
on a vehicle with that sort of mileage and a high likelihood of having been subjected to past abuse. Is the possibility of the transmission (mid-four-figure rebuild cost) turning into kibbles and bits 10,000 miles from now acceptable to you, given the amount of money you are about to spend?
At your price point, I'd be looking for the newest (and lowest mileage) gas truck I could find, and I would immediately rule out anything that had any trace of a fifth wheel or gooseneck hitch. Unless, of course, you have the resources (time, money, tools, work area, and expertise) to perform expensive/complex repairs yourself, and enjoy this sort of thing. Just my two cents.
Edit: Also realize that the pre-emissions diesel trucks' (LBZ especially) prices are artificially inflated as a result of the newer trucks' emissions systems that many folks find undesirable. In no sane world is a twelve-year-old pickup truck with 200,000 miles worth twenty grand. It's absolutely ridiculous; this madness is entirely an artifact of emissions regulation.