Trailer Valet RVR3 Remote-Controlled Trailer Mover with 3,500 lb Capacity, 40 ft Wireless Range, Dual Motor Drive, Built-in Battery, Low Tower Bracket, Electric Dolly for Boats, Campers, and RVs

I am so happy I found this, it has made my life much easier. I live on a busy street so backing in and out of my driveway is very difficult. This allows me to turn my travel trailer around in my driveway for easy in and easy out, as well as maneuver into a tight space at storage. It does have limitations, you need to be very careful and use chocks if you have any incline. On flat surfaces it's a piece of cake. One note, amazon suggests buying the ball and base, but you actually need the 3 piece system which consists of the ball, base and base connector (I believe the larger units come with this). Otherwise you can mount the bracket for it to attach to (which it comes with), but if your trailer sits high that will probably be too low. The ball connection sits higher than the bracket connection.

Lucas and the guys at Trailer Valet updated my unit to the Quick Swap RVR and it's been working wonderful since the update.

If your moving a boat or trailer across grass, gravel, or other such surfaces this is your mover. Was hard to spend that much money but worth every penny to move my boat from the backyard to front with no help. This thing is amazing so far. Used it several times and still just as happy

We purchased an RVR3, and it works well so far. actually, given we're on a flat surface, its fun to use. But ... the battery is incorporated into the unit itself and not removable. As the RVR3 weighs about 50 lbs fully assembled, it would be nice if the battery could be removed to charge. As our trailer is in a storage unit a couple of miles from our house and does not have an electrical outlet, thus meaning we have to haul the RVR3 back and forth to charge.