Stop in for a cup of coffee

I'm thinking of getting one of these to better move my car trailer around and into the garage. They are a little pricey but get great reviews. Tell me what you think or if you know of something better.
Power Dolly Videos | Watch TRAX trailer movers in action. (traxpowerdolly.com)
Craig, you might be able to fabricate a less complex version (non powered) that you could then hitch up to your small tractor? A ball a hyd bottle Jack a plate of steel and some heavy swivel casters?