Snowman and djbobo,
I read the 48re was "e-brake compatible" months age; but DC is still testing, and I could not order the e-brake with the 48re as recently as December. When I took delivery 3 weeks ago, they were still saying they had not seen approval from DC for putting the e-brake on any automatic/CTD. Without that approval, if the damage to the automatic can be blamed on the e-brake, then the warranty from DC is no applicable - which is why I cautioned about contacting Customer Service if that is necessary. If djbobo wants to stay within towing distance of the dealer that put on the e-brake, it may not be a problem.
Personally, since the e-brake can be added any time I am waiting for DC to issue their approval first. They recommend an e-brake for loads over 10,000 with a stick, but not with the automatic - at least not as of 3 weeks ago. Does anyone have more recent info?