Look underneath. On my Southwind, the bolts that secure the chairs and recliner go up through a frame member, through the floor, and a nut is installed on top.
On my slide, The bolts go down from the top and screw into a "T" nut. I believe they installed a "T" nut from underneath before they put the bottom cover on the slide. (I can't see anything on the bottom of the slide, just a smooth cover.
1999 Fleetwood Southwind 35S (Ford F53 6.8L V10 275hp 4R100 4 spd trans) - Toad 2003 Saturn Vue.
It won't do MACH 2, but I can get a sandwich and take a pee.