No doubt about it... that's pretty cool!
Living off your panels?
Depends on your parasitic draw. My old rig has virtually zero, so I stand to gain a lot from just 120W. Of course... this is all predicated on your location. There's a reason Sheble Aviation has it's flight school in Bullhead, AZ. They can keep their Cessna trainers in the air just about 365 days a year. Note they didn't choose a location in Washington state.
I think systems like this are good for those who have run out of roof real estate. Otherwise, I'd prefer the panels flat on the roof. They are less visible and thus less of a target for thieves that way.
And if you can't completely live off the panels... but you can shave off an hour of generator time in your campsite next door to MINE...
then I'm good with your 120W solar system.