A moisture meter is an RVers best friend.
Get one and use it to check everything from the floor to the ceiling. When you are checking walls and ceilings try to use an area where the pin holes left by the probes can not be seen.
Using a moisture meter when looking at TTs, saved me many headaches. The first thing I would do is check the ceiling, walls and areas around the sinks and shower.
As soon as the needle bumped we were out of there and on to the next candidate. Only when we found a unit that showed no moisture in structure did we look at a floor plan.
I use the meter every 3-4 months just to make sure that I am not getting a problem that has not shown signs yet. To fix the problems when they are small.
