The more I read about the Acme EZE tow dolly, the better I like it.
From their FAQ's page...
"Our tow dolly is the only tow dolly on the market that can be stored in a vertical position requiring a 25 inch x 102 inch footprint. Our dolly will easily tuck under the rear of most coaches about 85%. Our tow dolly is 102 inches wide, 92 inches long and 27 inches tall to the top of the fenders, weighs 415 pounds."
Thye also say that the tongue weight is right at 50lbs and since you can raise it straight up, it gets easier to maneuver. I like the fact that it can stored straight up giving little footprint. And of course being able to tuck in under the rear of the coach.