We stay at Many diff.Campgrounds around the USA. Even with a Water Press Reg. I shut it off when we leave. The water pump is turned off at Home as well as the Water heater,and yes I drain the House Water heater (2x) a year. The anode rod in it is (3ft) long,cant buy it at C/W for (12.00$).
We know our camper will not look like (Niagara Falls,Will You?)
If any one wants a (1st) Hand report,maybe (AquaMan) can (Wade In) on this Post?