Trailer brakes usually come on anything over 2900 pounds - that is the law around most places.
Most people are running the prodigy brake controller. I am running on of these:
Tru-Control Brake Controller
it is simular to the prodigy.
Installed my self. there is a pigtail for it that came with the sequoia - if you don't have the pigtail you can get on at the dealer - wire it up to the controller & plug it into your truck - pretty easy.