Who are the companies that manufacture semi trucks?

Answer 1

There are several throughout the world. In the US, it's PACCAR, Inc. (Peterbilt and Kenworth - they also own DAF in Holland, as well as the British brands Foden and Leyland - both of which were folded into DAF), Volvo A.B. (also owns Renault Trucks in Europe and Mack Trucks in the USA), Navistar (International), and Daimler A.G. (parent company of Mercedes-Benz, owners of Freightliner and Western Star, and they also bought out Ford's heavy truck rights and manufactured them under the name Sterling, which they discontinued in 2009).