Sounds like a great idea to me. I'd agree the self contained one might be a little more user friendly.
I'd look at setting it up to slide into a receiver hitch;I already have a couple of tools built that way,a large vise and a grinder. I'm planning for a drill press next. (might have to add a couple more hitch sockets and up-size the power inverter though)
Speed


1954 GMC 350
1957 GMC 1/2 ton
1962 Chevy C-30
1952 Chevy 6400 dump bed project truck
'98 Harley FLSTC
'66 Pontiac Catalina
'76 Chevy 1 ton Duallie
'84 Bronco II
'78 Dodge W-200
'81 Toyota 4X4 truck