That sounds like a pretty good idea to me. When you find the milling machine you'll be wanting, just drive over, load it in, and lock it down. Sure solves the problems of delivery and handling heavy tools.
Just curious, how exactly would you go about securing a Bridgeport mill in truck or trailer if you intended to both use it there and to drive around?
A while back I posed the question of putting my woodworking equipment in a trailer to keep the dust out of the other tools in my shop. The idea didn't seem to pass muster. I wonder what the response will be to this question.
The law of gravity is fine, but the minimum sentencing guidelines are much too harsh.