As far as headroom in the bedroom, the one that I looked at at the Back Home Rally offered about the same as a fifth wheel. I had to duck my head to move around.
There are tie down points in the cargo area. But street legal electric varies from state to state depending on trafic laws. Here in Ohio you must be able to maintain speed limits to be legal. Thats about 45mph on city streets and 55 on the freeways. I did not find anything electric that would meet those requirements.
2005 Sun Voyager, Safe-T-Steer
2009 Chevrolet Malibu, Blue Ox, SMI Duo,
Ohio Cardinal Gulfstreamers
FMCA Gulfstreamers International