Find a gradual downhill slope—not a cliff, just a gentle decline. Drive down at 30 mph and apply the truck brakes. If your trailer starts pushing you faster, you need more gain. If you hear the trailer’s brakes screeching like a haunted house, you have way too much gain. Adjust, then try again. It’s the Goldilocks of braking: not too hard, not too soft, just right enough to keep your back teeth from clacking together.
How to Use Your Trailer Brake Controller on Your Yukon - YouTube
Pro tip: Never use your trailer brake controller on icy or wet roads at first. It’s like giving a toddler a heavy book and asking them to walk on a freshly waxed floor. The trailer will lock up and slide sideways, and you’ll make a very interesting skid mark pattern. Learn in the dry, then graduate to wet conditions.
