I asked Mike at RVsRUS in North Oxford, MA about what the biggest enemy is of an RV. Someone thought the biggest enemy was the gas pump, especially as fuel prices continue to rise. However, Mike brought up some interesting points when discussing WATER and a HUGE WARNING to do it yourselfers. This is definately worth watching. It could save you THOUSANDS OF DOLLARS.
You can ask Mike any questions about this. He can be reached in the Boston area at 508 987 7760. Their website is http://www.rvsrsma.com/. I bring my RV there for service twice a year.