I think this old thread is worth reviving aside from the fact that I am also having the dilema.
First of all, I think these trailers are alot heavier than originally assumed in the thread. I just saw a common 28' semi box trailer with aluminum outer siding and plywood walls that actually said "12,200# empty weight." Figure lifting one end with the pivot near the back that is still quite a load.
I need to be able to move one around myself occasionally except mine is 45' and I was thinking maybe 17,000#. Difference is I do have room for a semi tractor to move it but the cost and hassle to get someone everytime is going to be a pain. The equipmeent I have now that I was throwing into the "consideration box" are 2 1/2 ton and 1 ton dumps, a 33K# FL curtanside box truck, an 8000# outdoor forklift, regular size tractors, a 2 axle lowboy trailer. May have forgot something. I'm wondering that if I don't get it up on wheels at 4 points to just pull it around the only option with what I have is to mount it on the 2 1/2 ton dumps or the FL 33K somehow. All methods seem like quite a venture.