I searched back to 2008 yesterday - I could find no earlier mention of linoleum and/or the rear floor-mat material.
Battleship Linoleum (the company) is mentioned many times over the years.
No mention is made of a correct thickness linoleum.
PLEASE: if you have a 47-55st Suburban - please let me know the approximate distance between grooves.
Forget about the depth of the grooves.
Forget about the thickness of the material.
As I posted at the beginning of this thread, I have found someone who says he has the correct thicker linoleum.
I will ask him for the name of his linoleum supplier/source.
He has a machine (CAD/CAM - CNC ?) that can cut the grooves and also cut the various hardware-holes in the floor matt.