Theres a MOST hub behind the left rear seat with spare slots if i recall.

The antenna connection maybe a issue. On hd tuner equipped cars the antenna connection from antenna diversity goes directly to the hd tuner in the truck, there it splits and then goes to the back of the ccc in the front. This is used by the CCC for traffic info.

The ccc is coded to use external hd radio tuner for all fm and am, and not use the internal ccc tuner.