Bedroom floor thickness

[TexasUltra]

Can anyone tell me the thickness of the floor in the bedroom of a 4275RW?
I know the garage is 1" thick, but I want to mount something under the bed and haven't found any info for the rest of the floor.

 

[david-steph2018]

Pull up the floor heating vent and you can measure there. But if I remember it is either 7/16" or 9/16".