Was thinking about the same thing - I found this web-site (
http://www.powermoverinc.net/) and they appear to sell the top versions but at $1K I think I will practice my driving skills a bit more before I invest in one of these + then I'd have another thing to store.
Iflyit - What size is your trailer? and What are the "silver" cups you have your wheels in? I just finished painting my new trailer but now need to come up with a way to secure my 40% - I was hoping to add a second level so I can put my 35% on top and my 40% on the bottom but I'm not sure I'll have enough room since my 40%'s tail is so high and my trailer was custom made to fit into my garage.
Also how did you mount your second level - is that just plywood?
*Pic's - Haulmark 5X10Vnose-