Both Clarke and Bona have units that are set up outside and are dismantled (not a trailer rig). Oneida(sp?) has a unit that some are praising. Clarke/Alto has a small portable that one pro I know raves about. My opinion is this. You need to define your needs carefully. IMO, those large, trailer mounted monstrosities are for larger,ego building shops. They are expensive and cumbersome. Who needs that? Bona designed the smaller Atomoic unit that runs on electricity. There are perhaps 20+ units out there in all price ranges.
Since my big machine does a great job of containing dust, I see no need to hook it up to a vac system. It's the edger and the buffer we need to concern ourselves with. If you're a one man op, then you only need a moderate system that will handle one tool at a time. It should be portable, efficient, well made, quiet as possible, energy efficient, easy to use, etc. A guy I know uses this and is quite happy with it.
http://www.clarkeus.com/Products.php?Br ... rke&Pro=75