I'm new to RVing, and I don't understand my fresh water tank. I assumed that it would be a sealed tank. If I fill it beyond 3/4 full I will lose A LOT of water when the coach is moved. I don't know where the extra water goes at fillup, but it comes from a hose protroding from the sealed bottom of the coach, which is a 1999 Beaver Monterey Redondo. The hose is not the low point drain.
