Recreational vehicles usually contain one or more life-supporting systems, such as water, gas and waste disposal. Check these regularly, too. Water systems need only to be drained periodically and flushed with fresh water. You can remove stale taste in the system by adding a mild baking soda solution to the flush. All you need do for the disposal system is to drain as required; for any complications, call a plumber. Propane gas systems for heat and cooking are usually maintenance free; just keep burner heads clean. All three of these systems do require occasional tightening of fittings. Check propane gas lines for leaks at connections by brushing on a mild soap solution and noting the location of bubbles. Never check with a lighted match!
Most motor homes have a 12-volt auxiliary lighting system that draws power from a second battery. Give it the attention you give your engine electrical system battery and you shouldn’t have any trouble. If your unit also has a 11 a-volt alternating current system for appliances, it will draw power from a separate generator that runs on gasoline from the main fuel system. Service this small engine regularly, too.