Wrinkle I see these options...(source:
http://www.sprinter-rv.com/wp-conten...ring_Guide.pdf
EN6 AUDIO 10 -$157 (looks like not having the headunit itself)
ER0 PRE-INSTALLATION FOR RADIO -$369
RADIO PREP
DETAILS & TECHNOLOGY
Pre-wiring (12 V) for retrofitting an aftermarket radio. Includes short-range interference suppression, a flexible
stub radio roof antenna and loudspeakers.
Note:
Pre-wiring not compatible with the multifunction steering wheel (CL4).
(looks like the wiring for and the speakers as well as a power feed). Obviously if get an aftermarket headunit the stock speakers will go too. I'll need to talk to an installer and see if having the wiring present is going to save me the $370 it will cost to have it present (because once the stock speakers come out that is all I will have left from the factory option).
Where are the rear stock speakers in a High Roof crew van anyway? I have seen many mounted in the upper part of the rear door but have always figured that was an aftermarket install location.