OK, I'm convinced. Edmunds has an article on this as well:
http://www.edmunds.com/subaru/brz/20...motorhome.html
I also doubt that I could get away with backing it on as I did with my Porsches because of the very low snout. I can see hooking it on something and ripping the front of the car off. I prefer a trailer anyway, but this was to be a one-time outing.