..I have been towing a 1998 Civic on a Tow dolly and love it. I don't have any problems loading or unloading and the wheels stay right where I leave them. I am usin a Roadmaster Dolly with electric brakes.
A few things I added were a spare tire mounted on the tongue of the dolly and a third wheel which comes in handy to push it around in the event you have to unhook it.
Normally at campgrounds I get a pull thru site and can leave the dolly hooked up to RV and just unload the car. If not then I unload the car and put pin in the dolly and back it in the campsite with RV. Usually at State Parks the dolly has to get disconnected as most sites aren't long enough for RV and Dolly. I even have a hitch on Honda so my DW can tow dolly to campsite if need be.
Enjoy it and it is the only way to go considering all the things needed to tow four down plus a lot of vehicles can't be towed four down.
One last thing to consider about towing four down and that is the steering mechanism. Normally you have the engine running with the use of power steering, well what happens when engine is turned off and no power steering? Do front tires turn as easy, no and they probably scuff or mess up alignment, a little food for thought.
2014 Winnebago Adventurer 35P,Ford F-53, V-10
2011 Ford Escape,2000 Roadmaster Tow Dolly
"Have a Great Day, Enjoy RVing."