For moving a dolly around, go to Harbor Freight or Northern Tool and buy one of their 2 wheeled trailer dollys. I got the one from Harbor Freight, and used wing nuts to assemble the handle so I could take it apart easily and carry it in the basement of the coach. It makes moving the dolly by myself as easy as walking the dog!
I agree, the Demco Kar Kaddy is quite likely the best dolly on the market. While new ones are not cheap, used ones, with surge brakes, can be found anywhere between $700 and $1500. I am currently watching craigslist for one. I did a dumb thing and sold my old one!