Oh, man!
For value:
1951 Ford F1 P/U (original)
1963 Plymouth Fury III
1966 LeMans
1969/70 Nova (six cyl)
For everyday dependabilty and economy:
1985 Subaru GL wagon (freakin bulletproof!)
Re: it seems so obvious!
Hey, I started out the same way with some old Craftsman boxes arranged identically...one tip...extend the wheels with a frame to the full width or it'll get tipsy!
We used the Reznor injection heaters in two different diesel shops in which I worked.
My family has used drip and mist-drop heaters in the past in our farm shop. These can be radiant, convection, or forced air, and work rather well.