Vehicles are described including a cab having a door opening on a side thereof, a chassis that supports the cab, two or more steps leading to the door opening, each of which is supported by the cab or the chassis, wherein the steps are placed within the recesses in the cab or chassis, and a door connected to the cab, wherein the door fits within the door opening, and the door comprises a lower door extension having a lower edge that terminates near to an upper surface of a lowermost step, the lower door extension covers a majority of the one or more recesses, and the lower door extension extends outboard to match the outboard extension of a fender or exterior cab side panel to provide a coplanar transition from the fender to the door, or from the door to the exterior cab side panel, or both.