I watched the Acme dolly video. I see a number of pluses, but it certainly looks like a ton of work to put the car on and off and store it at a campground if you can't get a long pull-thru spot. They don't show the guy getting on the ground to put the ramps on the dolly to remove your car.
We plan on purchasing a Toad - so, we're leaning toward flat towing a Mini Cooper with a manual transmission.
I've been driving BIG SUVs to tow my travel trailers for the past 13 years - Tahoes and Expedition ELs. They're nice vehicles, but I really don't need such a big vehicle for everyday use. Only when towing my TT.
So, now, with us buying a Forester I'd like to give up the big SUV and get something smaller.
The only positive I see with the dolly is I would have a wider range of vehicles to choose from AND I'd save some wear and expense on the Toad.
Also that Acme dolly with brakes and shipping is nearly $2,000. I don't know. Actual experience would make all the difference in this decision.