There is an extruded pvc product like that in rolls available - go find the nearest pipeline repair job since it's used to cushion pipe from debris during back filling the trench . The stuff I have is about 3/8" thick , yellow and has no top layer but it's quite heavy . IIRC , the roll width we use is 4' wide . Stuff is pretty tough and would breathe easily , probably could be colored different with dye or paint .
Sarge
Thanks Sarge. I'll look into that option. But I may just return to the same sort of thin foam-backed carpet I've been using (if I can still find any because I haven't seen any for a long while). Thinking about it, the existing stuff has lasted around 20 years and it didn't trap moisture (and I was able to fold it quite neatly over the wheel wells without resorting to seams).

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