No pickup truck, SUV or station wagon can be considered the "perfect pin-hauling vehicle".
The perfect vehicle would probably have to be a box truck with a lift gate because then you could just wheel the machine right in fully-assembled with the legs on and back box in the upright position, but as far as "normal" vehicles go it would definitely have to be a cargo van.
Here's my 1/2 ton Chevy Express cargo van. I can fit three machines in it but two are the norm.