The Reverse-A-Matic™ RM-70 trailer direction sensing system is a stand alone device that is independent from the cab. It uses the RM-60 as a base for customized applications.
The RM-60 base provides speed and direction inputs, two digital inputs, and 6 digital outputs. The customization can be as simple as changing a speed setting on an output, or a complicated as changing the function of each input and output.
The most common RM-70 is a the RM-70-M, which changes both steer lock wires to “power to lock” and changes one of them to lock at 35km/h instead of 60km/h.