haha This topic comes up all the time and everybody swears by their choice. Both systems work fine. After all the hot air, if you own and want to tow a car that can't be 4 down a tow dolly or trailer are your options and plenty of folks use them just fine. Some even haul their dream cars in enclosed trailers which provide the ultimate in protection for an expensive toad. If you own or intend to buy a 4 down towable, then going that way is a very good choice. I would never tell someone what they should do. I would try to help them understand the pros and cons.