I'm sorry. I just went through this discussion in another thread but somebody is going to have to explain to this newbie why towing 4 down is soooo much better than dolly towing. Dolly towing seems to me to be infinitely less expensive (assuming you can't install it yourself and I can't) and less hassle to hook up/unhook.
I just moved and dolly towed a car behind the U-Haul to my new, temporary living quarters while awaiting for the arrival of our motor home and it was so easy a caveman can do it. I just don't see the downside.