I just bought a 1991 Mazda B2600i. For $2000. Nothing is wrong with it, seats are clean, all dials and buttons work (except charger port doesn't charge, and minor emissions issue during startup). It's fuel injected, and it's the last truck Mazda made before going into that weird Ford/Ranger/Mazda partnership.
I've hauled 1000+lb loads in it ~100 miles many times, threw on a $200 roof rack from craigslist, and hauled ~800 pounds on that before.
I did have to replace the front brake calipers. Thankfully, everything on that truck costs next to nothing. It cost me $50 in parts.
Oh, and 27mpg.
PS - If you live somewhere hot, get the model with AC. It SUCKS not having AC on 100 degree days.