I am impressed with the thickness of the insulation in this Foretravel. I drilled these core samples when installing the cooling system for the lithium batteries.
I too, too was impressed... here is a sidewall core from installing a dryer vent in a 99' U270.
Don
30 yrs ago when we had the winnebago it came with samples of the floor, wall and roof construction much like your core samples only 4" x 6" I thought that was kinda' neat.