I'll 2nd Mike's suggestion about the Coleman on demand hot water heater I
got mine off of eBay for about $90. They used the standard 1 pound
ubiquitous cylinders. In about five seconds you have hundred plus degree
water. There's a showerhead attachment, as well as a hose connection. Runs
off of either 110 or 12 V. A great little invention IMHO.

Another favorite of mine is Coleman's tent light with remote. I think I
paid about 15 bucks for this guy. You can put the remote on your keychain,
hit the button and have instant light in the interior. I always meant to
hook up somthing to do this, but this solution was eloquent. A simple
magnetic base and it will stick anywhere inside the van. Best 15 bucks
I've ever spent. It has about a 20+ foot range.

Troy