Ended up buying a Demco Karkaddy II. Even though it was the most expensive (also looked at Master Tow and Roadmaster) I bought the Demco for the following reasons:
1) Storage capability - Toung folds in half and ramps fold up
2) Wheels on dolly turn when you are turning with your motorhome
3) Heavy duty construction - Just seemed to be built better than the others
4) Has a moving assist wheel for pushing the dolly around
It was a tight fit for the minivan (76 inch width max outside tire to outside tire) Minivan was 74.5 inches. Hooked everything up and towed for about 25 miles. Everything worked out great