Ditch the edge. A tow tune with a turbo brake scripted into it will be enough to make him wish he never messed with the edge. I personally like the edge insight for monitoring purposes. Like EVERYONE says Start with the EFI live, its the best thing he can do, and remind him that he can write it off on his taxes since he works with the truck. Then possibly take a serious look at towing twins. A complete kit that puts an S400 over the stock charger is around $3500 and are very tow friendly.