RWD doesnt' matter, but automatic (vs. manual) does. You can flat tow certain autos, Honda CRV for instance, but there are limitations and specifics. This is a topic that I'm sure is covered in spades on all the RV forums. Not many SMB folk tow a car given that not needing to is one of the beauties of traveling in an SMB (car sized almost) but I understand why you might like to.
I was told I absolutely could NOT tow my BMW 330 even though it's a manual, but hmmm, Blue Ox makes tow brackets for it. BMW nor anyone who works on them and not even Roadmaster (who makes the other 50% of vehicle tow brackets) want to weigh in on why so I decided to go for it. I've towed with no problems for several thousand miles now. On a Smartcar though you may have a warranty to consider. My car is older. Anyway, none of this likely matters if it's an automatic but you might want to ask around on the Open Roads Forum, IRV2, etc.