I use a power trailer dolly to move my 24' trailer around. I've been using it for the last year and a half. I could not get by w/o it as the space I to have to park and turn the trailer around is very limited. My dolly is electric and uses a 3/4 hp motor. It will move my 6500 lb loaded trailer with no problems. When turning the trailer around I usually spray the turning area with water to help reduce the tire scrub involved when turning the trailer in such a tight radius. My trailer has two axles, I don't know if I could make the turn with a 3 axle trailer. I got mine from here:

http://www.powermoverinc.net

Mark