An exhaust gas recirculation system for an internal combustion engine includes intake and exhaust manifolds that respectively receive ambient air and expel exhaust gas. The pseudo-random generator has an input adapted to receive a germ delivered by the physical generator and deliver at an output a pseudo-random output signal. Such a sensor signal has a corresponding morphology. The estimated occupancy state for the individual rooms in the building then can be used to generate a usage profile for the building. For example, the system may determine transmission angles of pulses transmitted at positions that did not encounter a physical object and then use the determined transmission angles to generate data representing visibility of open sky at these positions. At least one wheel of the wheel assembly is positioned proximate to the support member and the arrangement has at least one height adjustment device for operatively engaging the transport load with the at least one wheel.