I have 0 experience with those moving systems but I have little faith in any small DC motor that handles a lot of weight. The torque involved usually heats the motor up so that in a short time they fail. This is from using them in other applications like lifts, winches, actuators, etc..
If I needed a close quarters solution to moving a trailer, I would use a front mounted receiver on the truck or a small tractor with a bucket.
To Joshua's needs, I would search at aircraft suppliers to see if you can pickup a dolly wheel. I had one around here, years ago, 12" D, wide pneumatic tire (may have been foam filled) and a robust frame that had an attachment opening for handle or tug hitch. It weighed a pretty good bit but looked like it could hold up the front of a 727.