installed shut-off valves
The only one that was really necessary was on the toilet but decided to go ahead and put them on all the water lines. They were hard to find, and a little pricey (around $10/ea) because Jayco used 5/8" water lines rather than the standard 1/2" on my RV.
2012 Eagle Super Lite HT 26.5RKS
2005 GMC 2500 SLT HD D/A