This would make the most sense, in my opinion...Could this have referred to the specific glass or windows 'moonroof' installed in the car? Just guessing.
Bill
My 06 had one. Now that most of the outlets aren't live when the car is off, probably not much use any more.
VW has made two versions of the solar charger. Older ones had the "power outlet" (cigarette lighter) type plug and newer ones have an OBDII connector. I believe that all (or most) VWs come with one of these chargers from the factory to keep the battery alive during shipment. Most VW dealers have boxes of these things lying around and they get sent back to the factory for re-use. They are usually not still in the car when you take delivery. Sometimes they get sold on eBay and sometimes they are given away to customers who ask for them. These are sort of "off-inventory" parts and where they end up is a little uncertain.My VW charger has the plug for the diag socket, which is on all the time.