The Autocarrier was designed and manufactured by John Weller in 1908. It began its life as a three-wheeled delivery van, and it was not uncommon for a company to have a least one Autocarrier to be their delivery van.
Later in 1908 AC started to change the layout of the Autocarrier and came up with some different models.
The AC Sociable was an adapted version of the Autocarrier. This new version was adapted to have a passenger seat in the front and that is where the car's name came from. The Sociable was also used by the British Army because of their reliability and special bodywork was fitted so a machine gun could be fitted.
The Petite wasn't manufactured until 1953 due to WWI and WWII. The Petite was powered by a 346cc 2-stroke Villers engine. The Petite was the most different from the other 3-wheeled cars made by AC because it had a roof where as all of the other 3-wheeled cars didn't have a roof.