Thanks, I used AI and stated that the 310RL has a 1.5 inch floor of double plywood panals. Put in a request to Alliance but it was the day after Xmas so the response will be a couple of days. This sounds realistic. Horst
Well, I will go out on a limb here and say that AI might be leading you down the wrong path here.
While I don’t know the exact thickness of the basement floor, I am rather certain that it is not 1.5 inches thick.
Heck, sticks and bricks are normally only @ 5/8 or 3/4 inches.
You could remove your rear wall access panel and locate a hole in the floor for plumbing or wiring and measure the thickness yourself so you know for sure.
If I had to guess, I would bet on 1/2 or 5/8 at max. BUT as stated that is a complete guess. I would suggest you measure for yourself for piece of mind.