I've always used tekonsha (sp?) prodigy - handles my 10k with ease.
Easy to adjust. It has boost levels for increased stopping power. Once you get her dialed in, you can increase the stopping power at the push of a button. Once I get up to speeds around 40, I bump up one level and once on the highway, go up again. IIRC, it just applies the trailer brakes earlier than the truck brakes. Makes stopping faster/easier and takes a lot off the truck's braking system.
When I get to slow speeds, press button to turn boost off.
Going to try the integrated controller in the 08 this summer (if the unit doesn't sell).