RV plumbing is a bit different than plumbing in a home or business.
Everything from water pumps to faucets are smaller, and they have to work extra hard to do the necessary job.
The plumbing in RVs is also often called upon to work extra hard for several weeks at a time after being idle for several months, which is one of the major reasons why you it should have a checkup before traveling season starts.
If you primarily use your RV during a few months out of the year and then store it for the remainder of the time, you should also have the plumbing system serviced and drained before you store it.
When it comes to maintaining the plumbing system in your RV, preventative maintenance goes a long way.