You're best getting an older 1980's vehicle. Very easy to work on and very reliable, very easy to diagnose/repair compared to all the Chinese bullshit we have now. Get a 1984 GMC or Chevy 4x4… I would honestly not go with 4x4 though as they have more problems than standard 2x2 transmissions. If you really want something that will last and gets good mileage maybe go with something like an older early 1990s late 80's Suzuki Samurai or something similar. The older asian vehicles are fine too and easy to work on and last forever. Avoid 1990's+ domestic vehicles as they have a ton of problems and aren't built to last.