I think an Atwood would fit your needs well. I bought a travel trailer 2 years ago that had a leaking Atwood water heater due to not being winterized and split in a couple places. I decided to replace the whole unit, as I found a good deal on one on ebay. I installed last summer and used last summer and this summer and it worked great. Mine is a pilot light model that requires no power. We camped for a week in Illinois this summer and I lit it when we parked and I never had to mess with it the whole week.
The pilot light does seem to help maintain the tank temperature, the burner rarely lights unless you are running the hot water.
Most RV dealers in my area carry parts for them, or can at least get them.
