Not only do you not need a brake controller for 1000 lbs, you don't need one for 3000 either. Uhaul trailers for instance, have surge brakes. Like Dinanstu, I'm not saying you shouldn't get one but it's by no means a requirement, plus unless you get a reasonably nice trailer, it won't have electric brakes anyway.
I'd be more concerned with the ability to strap a proper load bearing hitch to a unibody. The typical hitch you'll be able to get is only good for about 300lbs tongue weight, so that's about a 3000lb trailer+load.