Has anyone thought of using solar to heat water while they were camping? I thought of this when I was researching some ideas for diy solar heat for our 18' above ground pool. I ended up getting a really great deal on a commercial solar system so I didn't need to diy one. But why not for the camper? Hmm. I saw an idea where someone wrapped a black garden hose in a coil (progressively getting larger). Something like this but on a smaller scale. You could put it on the roof or just lay it on the ground behind the trailer. How hot does the water get in your normal garden hose just laying on the lawn? Pretty warm. You could run a "Y" inline with the city water hookup just before it enters the trailer. Run 1 line into the trailer for cold water and 1 line to the hose. A second "city water" inlet could be added to the outside of the trailer to accomodate the other end of the solar hose. The second water line would be hooked up to the hot water handle on a 2 handle tap at the sink. Obviously this setup works only if you have city water connected and only if it is sunny. But this could produce enough hot/warm water for dish washing, hand washing and maybe even a very quick hair wash/shower. Just thinking out loud for now as I have no immediate plans to build one. Any ideas or comments are certainly welcome.