It would have to be simple, basic, affordable. Maybe a stripped Jeep (kinda pricey anyways), or like a Ford Ranger. There were diesel Rangers fro 85-88 or so. They are sought after now by Ranger guys
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Imagine a 80HP or so diesel in a little truck or SUV. you could get 50 MPG+, have a biodiesel option when (not if) the SHTF, and it would last forever. Some guy was selling a diesel Rabbit p/u (remember those) on CL here. I'd have looked at it but I blew my 'spare' $ on my ATV!