George,
Unless you just want to replace the faucet for appearance reasons, you can replace the stem. I believe that your coach used Moen faucets, and parts should be available at a plumbing supply store or home improvement store (Lowes or Home Depot).
As for your shower fixtures, that is a bigger job on most floorplans because you have to remove interior wall panels to access the back side of the shower to replace the fixtures. However, it is doable if you want to.
Gerald