Larry,
Presently, we add no insulation to the slide room floors as they are typically 1" thick slabs of plywood. We add carpet padding and carpet.
That said, the optional Yetti package on the Landmark San Antonio and quite possibly, later, other Landmarks, will include a layer of insulation in the slide room floors. I do not have any detail on it or what R-Value we'll end up with in those floors. Stay tuned
Jim