Abstract: Method and arrangement for providing a modular tractor assembly including a driver compartment having a rearward connecting edge configured to slidably receive a complementary forward connecting edge of one of a day compartment module, a sleeper compartment module, or an inter-modular fairing connector assembly. A portion of the rearward connecting edge of the driver compartment has a flange portion disposed at an acute angle relative to a long axis of the tractor for complementarily receiving a forward connecting edge of one of the day compartment module, the sleeper compartment module and the inter-modular fairing connector assembly. The interface between the driver compartment and the day compartment module, a sleeper compartment module, or an inter-modular fairing connector assembly is substantially hidden by the doors of the vehicle to provide an aesthetically pleasing appearance.

Abstract: A modular cab/sleeper/roof structural assembly for a truck-tractor vehicle according to the present invention provides greater manufacturing flexibility and unrestricted access between a cab/sleeper unit. The structural assembly includes a top-free cab unit having a front wall, opposing side walls, and a bottom portion. A top-free sleeper unit positioned behind the cab unit has a rear wall, opposing side walls, and a bottom portion. Fasteners couple the cab unit and the sleeper unit such that an upwardly opened carriage assembly is formed. A unitary roof member fixedly encloses the opened carriage assembly and forms an integral modular unit. The unitary roof member has a front portion connected to the front wall of the cab unit, a rear portion connected to the rear wall of the sleeper unit, and opposing side portions connected to the opposing side walls of the cab and sleeper units.

Abstract: A modular cab/sleeper/roof structural assembly for a truck-tractor vehicle according to the present invention provides greater manufacturing flexibility and unrestricted access between a cab/sleeper unit. The structural assembly includes a top-free cab unit having a front wall, opposing side walls, and a bottom portion. A top-free sleeper unit positioned behind the cab unit has a rear wall, opposing side walls, and a bottom portion. Fasteners couple the cab unit and the sleeper unit such that an upwardly opened carriage assembly is formed. A unitary roof member fixedly encloses the opened carriage assembly and forms an integral modular unit. The unitary roof member has a front portion connected to the front wall of the cab unit, a rear portion connected to the rear wall of the sleeper unit, and opposing side portions connected to the opposing side walls of the cab and sleeper units.