Vehicle frame siderails with standardized positioning of attachment support holes

The invention relates to a motor vehicle frame. The frame is constructed from two parallel siderails running longitudinally down the length of the vehicle. An intermediate cross member support is positioned between the siderails to support a driver's cab. A datum support hole is positioned through each siderail to support mounting of one end of the cross member support for the driver's cab. The remaining support holes are arrayed in rows and columns positioned with reference to the datum support hole. A first row of supplemental support holes runs parallel to a bottom flange on each siderail and includes the datum support hole. A second row of supplemental support holes in each siderail runs parallel to and above the first row. A third row of supplemental support holes in each siderail runs parallel to the first and second rows and is positioned above the second row by the distance as the second row is above the first row.