Sorry, I don't spend every waking hour on here - I have a business to run after all.
I'll have to measure mine and report back. I'd be surprised is it's any more than a layer of dynamat and then the plywood.
I had once posted a video of the insulation going on the walls, but I forget where it is. It may show what's going on with the floor.
None of these vans is going to have much on the floor. Some may spray the underside of the van. Winnebago doesn't.