I have the Unified tow system. You should have received a manual when you bought it that will explain how to adjust the gain. But if not, I adjust mine by trial and error. Once it is set, you really don't need to make any further adjustment. I have mine set between "4" to "5". When you stop you should not feel the tow car pushing you or feel it dragging behind pulling you. That can be hard if you have a large diesel pusher; you don't often feel that little weight behind you. But if the gain is drastically out of line, you will feel something; either the car "slamming" (drastic image) into the coach. Or a dragging feeling. If it is set too high, you'll drag the tires. The car and coach should stop in unison.
The Unified system also has a connection that will keep the towed car's battery charged; make sure that is working.
Marsha~