I have no idea why Jim posted the link for the C5500....is not the correct vehicle. Again, I'm not addressing legalities.
Matt, my concerns would be driving the car on to the rear deck, but after looking at the truck this morning, it seems like it would handle it easily. No one wants to be that guy who drives a car onto a deck, and the deck snaps in half....welcome to YouTube.
It seems Uhaul does retire and sell quite a few of these things, and with some minor fab work, you would end up with a nice hauler which has been very well maintained, and parts are available.