basically, it goes panel to disconnect to converter to machine. But, after commenting i did some more research and basically it is a bad idea to connect a cnc machine to a static phase converter because it not only affects torque, but also spindle speed, which, as you know is very important to a cnc machine.
Travis, if you need help I'm pretty good with autocad inventor for designing a mount... Hall effect sensors have a lot more repeatability than a mechanical endstop.
Travis, maybe you could just build something over the camper instead of attaching it to the camper...
What about a tarp. Not resting on the camper, but situated just over it at an angle. During the winter just put some heaters on top of the camper and it will keep the tarp above freezing so the snow will melt off, or, alternatively cause a really neat bon-fire