i picked up a 99 f350 4wd, cc, lwb, dually, v10, 4.30, limited slip, 100k miles for $6000. body is perfect, paint is perfect except for the tailgate. interior is okay, there are a few things broken such as: cup holder, pass small sun visor, cup holder, one blown 12v cig ligher. I performed about a $1000 of work (did myself), added air horn, new shocks, brake rotors, pads, brake lines, balanced drive shaft(i sent this out to a specialist), new front tires, radiator flush, radiator hoses, thermostat. this beast gets 10-12 on the highway and <10mpg on the street. But it tows my little 18' ultra lite travel trailer like it's not there.
i've had it for six months and driven it 4k miles, sadly more for work than camping. i've hauled over 4k pounds in the bed numerous times for 100 mile trips. no problems on any of these trips. good deals are out there, go for a gas engine 1999 or newer 3/4 ton or better, you won't have that nagging feeling about having enough truck.