This 1929 truck model by REO (an abbreviation of the founder’s name Ransom Eli Olds) with a 67 HP, 6-cylinder also had a bus variant and was a huge success right until the late 1930s. 

This bus model called the REO Speed wagon also inspired the famous 1960 rock band called REO Speedwagon who had a cult following in the seventies and the eighties.