HI. Four down is the way to go if you can tow your vehicle that way. I bought my first Class A last year and purchased a tow dolly for my FWD Lincoln MKZ. I did this because to go 4 down the cost was roughly $4k since I don't do that kind of work myself. The tow dolly (Acme EZ tow) cost me $1800 with spare tire and shipping. But - at 67 years old, I've found that getting it loaded and unloaded, safety chains on, etc is just too much for me. I'm getting ready to sell the dolly and plunk down the bucks to 4 down my 2012 GMC Terrain which can be dinghy towed. If you're young, don't mind getting down on the ground to do the safety chains under the chasis of the car, then it's cheaper to tow dolly, but if not ...:(
Steve