A vehicle apparatus and a vehicle rack system comprising at least two vehicle rack apparatus are disclosed. The unit includes a shaft and a rotary brush mounted on the shaft, with a bearing support assembly supporting one end of the shaft and with the other end being unsupported. The twine cutting knife is formed with an elongated, serrated cutting edge extending a distance greater than the radius of the twine holding disc presenting an elongated cutting surface to said twine. It appears to a developer as if the data chunkscontainers last forever, whereas in reality, the API hides the fact that the data is being transitioned to optimize system performance. A color measurement of the individual’s preexisting teeth is then compared to the reference table to determine which particular dental construction will most closely match the individuals preexisting teeth.