Have u bled all the air from hot water tank till it's clear and not bubbley or foamy looking?
A few campers had that at one campground on a well with little pressure. We ran the hot water side on the kitchen and bathroom (shower and sink) till solid water and it went away. Guess there was a pocket of air in the top of the on about 3 of the 6 campers. Something to try if u are not finding any leaks but uses a lot of water if dry docking. We were just using to have pressure while his new well pump came in.
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