Integrated trailer brake control in the new truck

[KathyandDave]

I set our Sierra at a gain of 0.5, which felt right, then barely got stopped in a surprise situation on a highway at about 80km/h or 50mph. So, I replaced the Monty brakes with the forward self-adjusting type (with xnavydiver's help). Now, I've increased the gain to 0.8 and, although she's tetchy at low speeds in towns, she stops great on the highway.
There's no science in that answer, but it works for me.