http://www.powercaster.com/
I had a booth at the California RV Show for many years located across from the family that developed the Power Caster. I heard many success stories from TT and boat owners regarding the use of the power caster. It seems to work well. I see used ones listed on ebay and Craigslist from time to time.
My dad, my brother and I used to use a 5 foot tall heavy duty two wheel hand truck to lift the tongue of the family 18ft TT. Dad would maneuver the hand truck while my brother and I would push on left & right corners to get the TT into or out of a spot behind the house. It took a lot of muscle but worked.