The connection to the tank is most likley not accessible. It will have a vacuum breaker installed in the line, that is acccessable aft of the bathroom, most usually by taking the drawers out of the bedroom streetside cabinet.
That valve can get foreign material in it, causing it to stick open, thus flooding the floor, and below floor compartments.
It is a bit of a twist to get to it, but, they use a good grade brass valve, that is serviceable.
Your floorplan may be different, they do vary, if you notice the flooding, go inside, look for drawers you can remove, you will find it. Not that bad a fix...
Back to a 5'er after 4 yrs fulltime.
Pulling with a '14 2500 ram, 6.4 Hemi.
Montana High Country 31RE