Long Roof made about the same guess I would have made. Roof air adds some value, but only a couple hundred bucks if it is complete yet not working. A fully functional factory A/C system with roof air that runs on cool R12 can add a grand to a truck with few flaws. 2wd burbs are usually worth less than 4x4s. In great condition, either go for over $10,000, but that is in great, original shape with low miles or really well restored– though not necessarily "concours" restored.
Could you describe the rust in more detail? Pics would be best, of course.
BTW, where does one find "chicks" that dig 3-door burbs?

I'll take hillbilly, redneck, sophisticate– it don't matter as long as they like my burbs!