Hey Doug....what kind of brake controller do you have? Did you like it after this trip?
I have the same controller in the Tahoe and the GMC, just by chance. GMC had one in it and I bough the Tahoe unit 5 years ago. One says draw-tite, and the other says Reese I think.
My next one will be the "need sensing " style, and you should buy nothing else. It senses the braking situation and applies force accordingly. On the standard models, like both of mine, you set it, and that's always what you get, light or hard braking. If you need more, you have to reach down and manually turn up the force.
Here's what you want:
http://www.drawtite.com/dt20185.html