The trailer suspension is always bolted to the chassis of the trailer and as such the connections need to be maintained on a regular basis to ensure smooth running of the vehicle. With our deteriorating road condition in South Africa the maintenance checks generally must be intensified as the vibrations of the road will loosen a bolted connection a lot quicker. BPW recommends that the connection points of the suspension be inspected for tightness every 6 months, however, should be reduced to 3 months if the vehicle operates under harsh conditions.