What controller have you gone for.
We have 3 Tekonsha Prodigy controllers on our vehicles and have found them very reliable, electric brakes on horse float, boat and caravan, all brakes on a single axle but they will control 3 if you choose to have brakes on more than one axle.
I installed it today, I went with the OEM Ford unit. It plugged right in and fits in a little slot specifically made for it in the dashboard.
I'm getting it programmed to the truck on Saturday morning. It's nice to be able to adjust it on the dash and select which trailer I hook up too from the trailer tow menu.