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We have the same setup as you do until I traded trailers. If you you will use the tow/haul mode on your truck it will take care of most mountains. I use the brakes very little in the mountains. Right now we have the original brakes on our truck (125,000 miles).Have been in every state but 2 so far. I love the Allison trans, it does good. Just do you regular maintenance and it will last for you.
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