I'm running and Edge box on my 01. Also have the CTS. Besides the gauges and EGT, I find the truck just tows better. Before the box it would shift a lot more between 4th and 5th. With the box on 1, the hunting is way less.
I usually run on 1, mileage. Read on their site not to use tow mode if towing heavy so I don't.
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2010 Cougar 30RKS
2015 GMC Sierra Max Trailer
"Drinks for 6, Dinner for 4, Sleeps 2"
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