Why would you want to lock up your brakes? I'm not certain, but I think the Chrysler controller is proportional based on the brake pedal. Unless you're locking your tow vehicle brakes, the trailer brakes aren't going to lock either. In one of the menus you can get a graph of the braking power being applied. With the graph, mine doesn't even go 1/2 way when I slide the test lever, but I've seen it go much higher when testing panic stops in a parking lot, stomping on the brake pedal.
The Prodigy use a pendulum for their proportional response... my P2 was getting fooled all the time coming to a stop on a steep driveway aprons, because of the tilt it was misreading the pendulum and applying way too much braking power. Never had that problem since switching to the Chrysler controller.