When I saw "show and go" I thought it was going to be a toliet bowl or something similar to the one on the old "Home Improvement" show with the "mans" bathroom but a folding chair would be lighter at least.
Battery power is very interesting. There will be lots of new developments in that with the price of gas going up and up. I suppose if you had a solar power charger that you could deploy on the roof you could just keep going on forever, charging while the car was parked while at work.