We had an OTJ (over the john) cabinet in our last camper. I found a stud to mount it to, and used toggle bolts for the areas where there was not a stud. No issues with it staying in place. We needed the storage, but it made a small bathroom feel even smaller. We elected to no hang one in our new current camper because of this.
With the ceiling and floor materials being thin, I would be cautious to not put to spring pressure on a floor to ceiling cabinet. You might end up putting dimples in the floor and/or ceiling. If it does not have enough spring pressure, it's not going to stay in place during travel.
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Chuck Roder & Family '07 Surveyor SV-235RS & '16 Chevy Silverado 2500HD (Gas) Crew Cab High Springs, FL.
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