"I had my 2014 Fleetwood Storm Class A RV out this past weekend ...."
Water heater did exactly what it was designed to do.....relight on flame failure.
It will do this 3 times and then 'fault' (no more attempts and light will come on at ON/OFF panel).
Oven pilot flame......
Both have same issue.
Lack of propane flow due to lack of use.
Propane system needed flow established and a demand placed on regulator (folks say that need to purge line of air...no air in system just no flow)
After a period of non-use fire off the stove top burners on high. This will 'purge' the lines (establish flow and place demand on regulator)
Remember propane system is less than .5 psi.