When I saw 10.00 Euro on the website, I did a doubletake. France? It makes sense. After WW2 in Europe, it was stated that it was financially more logical (?) to dump military equipment in the ocean than bring them back home. The stuff that wasn't sold or dumped became a "storehouse" or junkyard for old equipment and parts.

Back to the bus.

I doubt the Flxible ever made it to Europe so my guess is it was used to transport troops here in the USA. I would expect a US military archive would be the best place to find a tech manual on this bus.

"Adding CFM to a truck will only help at engine speeds you don't want to use."
"I found there was nothing to gain beyond 400 CFM."