I've a 2013 21' Rubicon and I know the tanks are somewhere beneath where I would like to add a table post socket liked the 3 in the rear. Does anyone know if there is space between the floor bottom and top of the tanks? I'm hoping to add a small coffee table in front of the large forward widow across from the stove.
Get one of those collapsing tables. We had one in a 2012 Denali. They can be used outside, or in. When traveling we collapsed it and then strapped it to the back bench seat of the dinette.
Use 1" no 12 screws and then you won't have to worry, that is if you have a 3/4" plywood floor.
Just screws are not the ultimate answer. If do a little research, you may come up with a a way to secure the table so the screws would not loosen up. I would use an anchor of some type and possibly machine screws or short studs.