The Transpak battery operated chassis units are permanent, dedicated "bolt on" non-detachable power source modules to convert previously troublesome loaded trolleys into easy safe self-powered units. Ideal for transporting existing meal trolleys, bain-marie, cook/chill units, laundry trolleys etc. It is supplied standard with a "back off reversing bar or button" that prevents an operator being jammed against an obstruction. When activated, it automatically reverses the direction of travel away from the operator for a few seconds. These are a semi custom design units to suit each individual application.