Originally Posted by BarbandBob
How much do I have to rely on my brake buddy going down steep grades or will the allison trans suffice?
You don't want the BB adjusted to continuously apply the brakes, you will wear them out or cause a brake fire that way.
The RV will provide speed control by you downshifting and using engine braking to retard speed. The brakes should be applied firmly to reduce speed by 10 mph then foot off the brake until the next need to reduce speed by 10 mph.
The Brake Buddy uses a momentum sensor to apply brakes, if in doubt, put it in the passenger foot well and take a drive around a parking lot. That's how I verified the sensitivity setting I wanted. It only applies brakes when it senses a sudden slowing of speed, not a constant speed.