I have a Jayco TT with an outdoor kitchen and shower. The kitchen has a sink that is plumbed into the holding tank. We are living in it full time at least until February. With temps dropping into the ...
If it were me, On that outdoor kitchen and shower I would disconnect the hot and cold pipes some place in side the trailer and cap them, and make sure the traps are disconnected and drained. Also open all the faucets before you cap the pipes to drain any residual water out of the system. If that outdoor shower has a flex hose on it, take the shower head off, and then let the hose hang down.