I don't know what the "best" is, but I'll throw in a vote for a 2wd Toyota Tacoma or even an older "Pickup" (literally the name of the vehicle). The 2.4l 22re in the older trucks is pretty much bullet-proof as is the 3.4l (I think) V6 in 1st generation Tacomas. 4x4 Toyotas are expensive to say...