I built a trailer mover with plans found on ebay and added a second 10' garage door on the rear of my garage so I can store the boat in my back yard during the winter. My garage front door access is via an alley so this lets me move the boat around to get everything lined up so I can push thru the other door into the yard.. :)
http://www.youtube.com/watch?v=2skM1...wLr8laNUDBnM0g