How much power? Enough to survive the zombie apocalypse, just kidding.
All the main toys like TV and laptops. Plus small music studio, music amp, keyboards, hard disks, RAID, USB media player, satellite internet and a few more. Maybe a small DC frig. I opt for a used cargo van. Something like a Chevy Roadtrek also OK but I prefer a large van.
You mentioned a portable solar unit and that's the best idea. Perhaps custom assemble it from panel pieces and place in a hinged wood or welded frame that could attach to a roof rack with some type of latch. Or I saw a lot of foldable stock panels out there to buy. Thanks, a good start.
Security with some SMS scheme that works on cheap phones also a great idea.