Sounds like Gliders (truck) though those are usually to avoid emissions requirements. https://en.wikipedia.org/wiki/Glider_%28automobiles%29#Glider_truck https

Sounds like Gliders (truck) though those are usually to avoid emissions requirements. https://en.wikipedia.org/wiki/Glider_%28automobiles%29#Glider_truck https://en.wikipedia.org/wiki/Glider_%28automobiles%29#Glide...