I found these old trucks on a parkinglot in an industrial zone in Heerlen (de Kissel). The owner imports them from the States and resells them to vintage car restorers. I chatted with him, and he told me these trucks are very hard to find nowadays. The bus is a Dodge 1948 schoolbus. The truck is probably a 1952 Ford F2.
I had wanted to finish the left part of the bus as well, but my hands were too cold to proceed. I decided to leave the drawing this way.