The Trip Tec (now listed in the options as Trip Travel Information) is available on the Mountain Aire and above as an option and the information is displayed on the rear camera monitor. Cost is listed at $1,266. Not sure if you can install it on a DSDP as a special but I'm sure someone else can verify if they have.
I ordered the GPS but not sure how often I will use it. I have a stand alone Garmin unit that doesn't work well (locks up routinely) so I'm hoping the in dash unit is better. Figured what's another $1,000 at this point.
Easier to get it installed initially than to have to add it later!