I really love the exhaust brake on my VGT turbo. There is a very long steep canyon near Salt Lake City. Coming down it the first time I towed the trailer with my new to me 2007 Dodge Ram 2500 Cummins. This canyon has some places that are 13% grade. Just using the exhaust brake I didn't really have to push on the brake pedal. Actually there were a few times I had to push the gas pedal so the exhaust brake would let go so I could get back to the speed limit. It works that well.
2007 Dodge Ram 2500 6.7L Cummins
2016 Jayco Jay Flight Elite 27BHS