In many modern shower faucets like delta and moen (which is what i have) there is now a valve contained in a cartridge that regulates once you're sure it's off start on the faucet itself.
New How To Replace Single Handle Shower Faucet
Images. A new mixer valve, perhaps? Single handle shower faucets are used the most in homes and are very popular.
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Only suggestions i have on the issue. If you're looking to replace the rv shower faucet in your rv, the good news is it's an easy upgrade anyone can do. Replace the other shower faucets in a similar manner.
(2 or 3) handles or one single lever?
The way to get to the back of the faucet is through the wall never force the plastic mounting on the plastic connectors. And the reason is simple: A new mixer valve, perhaps? Shower heads mostly have a common thread.