I would look at a 92 and up Dodge, that's when they put an intercooler (charge air cooler) in them.... 94 to 98 would even be better. Or the old Fords with the 6.9's are good "basic" trucks, not a real powerhouse but they get the job done..... The Warden has a nice 4X4 and he can tell you a lot about them.

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1985 300D Turbo ~225k
2000 F350 (Powerstroke) 4X4, SWB, CC, SRW, 6spd ~148k
1999 International 4900, DT466e (250hp/660 ft/lbs), Allison MD3060 ~73k