allright...these all look and sound like pansy showers.
want to hear about a real shower?
i met a guy from Utah on the Lockhart Canyon trail (go there, do it; all 80 miles of it) right outside of Moab and he had an '85 Hilux. I had an '84 at the time, so I stopped to chat...
He had fabbed a dual alternator set up, and running off of his second battery were all of his accessories. He had topper interior lights, a second fuel pump to pump fuel from his aux. tank into his factory tank...here is the kicker...he also had a medium sized water pump.
He had taken a bunch of copper wire (like 30 feet or so) and wrapped it around the entirety of his exhaust system. Somehow (can't quite remember as this was about 2002) he had a water hose (could also have been copper tubing now that i think of it, wrapped around the exhaust) which was attached to the water pump, and when he turned it on, the exhaust system instantly heated up the water (probably super hot I would imagine)!
How is that for a raging shower system?
The bags dont have good enough pressure and aren't super hot, and the 12v under-hood heaters also were too wimpy for my liking, though plenty hot. I may have to try this, once I get my dual alternator set up together...
-andy
p.s. If you had an actual hot water tank, you could heat your water while wheeling, thus lowering the environmental guilt factor!