To accommodate our customers, TNH will install portable hand controls units that the customer provides to TNH in order to test drive a vehicle so long as the device can be installed and removed without physical modification or alteration to the vehicle. If the customer does not have a portable vehicle hand control unit, TNH will provide one. For the safety of our customers and employees, these hand control units are installed at our service department. Appointments for a vehicle test drive using a hand control device are recommended to ensure that a licensed technician is available to install the hand control system and safety test before the customer test drive.