This is mentioned in the article but it's strange to me because I've been in heavy truck factories in India and 80% of the vehicles are produced without a truck

This is mentioned in the article but it's strange to me because I've been in heavy truck factories in India and 80% of the vehicles are produced without a truck bed or cabin. They are simply sold frame-only. Apparently the trucking companies prefer to build their own wooden beds/bays and cabins, which is cheaper anyways. I have to assume this is also true in the past but maybe not?