 It retains the Ford F550 automotives but the ladder frame chassis is no longer required, the engine/gearbox utilising a sub-frame assembly that bolts to the monocoque.The key benefit of the monocoque design is a greater level of underbody blast protection without increasing the height, center of gravity, or weight of comparably configured base vehicles.A stated advantage of the monocoque is that a custom wheelbase can be selected without the associated engineering challenges of shortening any chassis.