The "6" setting is the maximum output that the controller will ever send to the trailer brakes. The display you are seeing is the real time output being sent to the trailer. It is a proportional controller. Or for lack of a better term, a smart controller. It adjusts the output based on incline and the amount of force you apply to the brakes. You will notice a difference in braking between a TV with no trailer and one that is hooked up. It won't, and you shouldn't be trying, to stop in the exact same manner as you would with no trailer. It will take a longer distance to stop and you should plan to start the process sooner.