Thanks for the replies. Although gravel, the driveway is flat and pretty packed down. In looking at the videos for the Trailer Valet, it seems like the hand crank (or the attachment for a power drill to move the gears) would do the job pretty nicely and be a lot easier than pushing or pulling something like the Harbor Freight or Tow Tuff dollies. But, I will talk to the manufacturer and get their take on it. The power dollies are too expensive for me.