Replacing a kitchen faucet in these trailers is pretty much like replacing any kitchen faucet, only the working space in these RVs is considerably smaller than in a home. If you’ve done it before, there you go, if not, Search YouTube.
Depending on your particular coach, gaining access to the underside of the sink may be challenging. If the nuts are rusty, if your lines are copper, pex or some jury-rigged hose will also impact how easy it is. If it gets too complex, you can always pay a plumber, but most DIYers can do it.