When we bought our 31' TT (7200lbs) I had a brake controller installed by the RV store. They installed one made by "Brake Force" that was horrible! It was timed. The brake controller gets 14.4v when you hit the brakes no matter how hard/soft you hit the brakes, it's up to the brake controller to determine how much voltage to send to the electronic brakes on the trailer.
The timed ones send full charge in about 3 seconds. That "Full charge" is variable depending on how much you turn the wheel on the brake controller.
If I had it set so that coming to a stop felt "normal" then when I was on the freeway and barely hit the brakes the truck surged to a stop in about 3 seconds.
If I had it set so that it felt "normal" when I was just slowing down on the freeway, then I would have to stand on the brakes to get it to stop at a stop light.
I switched out a day later to the Tekonsha Prodigy (My dad has the same one) and couldn't have been happier, it's proportional so it felt "normal" whether I was just slowing down or coming to a complete stop. It was WELL worth the extra money.
Now I bought a new 2500HD with the integrated brake controller, and I can't WAIT to haul that travel trailer next week!