I am trying to winterize new camper since temp is dropping in NJ- I drained all lines + water heater- I then hooked my compressor up to city water inlet- With it connected with at least 30PSI- I ne...
The air going into your tank will pressurize it and hence backward up the lines to your various outlets(don't forget the outside shower!).
When I do my air blowing in the fall I only open one outlet point at a time. I used 25 psi. I can feel the air come out. So I do not have the tank valves open at the same time as the kitchen faucet for example. I do the tanks last.
I think you will be safe with this approach.
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