It refers to the vehicle used in rural areas, specifically in the Northern Mexico geographical area, which was used by farmers or ranchers in the region pulled by a pair of oxen carrying food or people.
VERY LIGHT PASSENGER GUAYIN:VEHICULO OF FOUR WHEELS AND FOUR-DOOR SIDES, WITH SPACE FOR PEOPLE OR CARGO.
In Mexico, also this name is used to designate usually wooden vehicles with four wheels iron or wood and pulled by two mules or horses, used for transporting people or agricultural products in rural communities.