I have a Power Caster PC-3. I bought it to pull my 7000 lb. trailer into my driveway (so the door would face the house). My street and driveway are fairly level, and are paved and cement. There is a small "hill" going into the driveway.
The PC-3 pulled it just fine. Takes a while, though. Also, the brakes do need to be hooked up. The PC-3 will not stop a moving trailer. I did have to use quite a bit of muscle to turn the PC-3 with the tongue weight (even when moving).
The PC-3 has a cup the fits your trailer's tongue jack post: I didn't like that, so I built a bracket that bolted and used a ball to attach to the trailer. The bracket had a post that went into the PC-3's cup.
They are pricey, but it does work very well.
