Early '70's Buick, any model... If you want something old and without air bags, put as much metal between you and them as you can.
79 Monte Carlo... with a small block, cheap parts, great heaters in those years of GM's too.
Early year Bronco or S-10 Blazer/Jimmy 4 X 4. Will go through anything with the right tires on it and haul quite a bit of junk in the back like all good beaters do.
