Damon had a "SAT Prep" option in all Class A's.
It is very easy to see if your Challenger has the optional wiring by looking inside the entertainment cabinette for 2 extra/unused coax cables...
One runs to a chase in the roof covered by an exterior plate or faux plumbing vent on the roof where there actually is no plumbing.
The other runs to a bin (probably the front most driver's side bin) for a portable antenna connection.
As a side note, our SAT antenna installer did not use the SAT Prep wires and added a new coax under the front cap (described a warranty concern as the reason to add new wiring).
It was no difference in install price, so no problem to us.