Converting Dining Table to Booth Dinette

Does anyone know the thickness of the floor in the main slide of a 3455 rl 2012 bighorn I need to fasten a base to the floor as I am building a new table 20 x 48 with a fold up leaf and it needs to be stable

Thanks Capt RC RB 2012

Capt, we would also like to convert to a booth so I hope you'll let us know how your conversion goes.
augie