Thx for the replys.
http://accessories.us.dell.com/sna/p...9&sku=310-8555
with this a the power supply for the docking station:
http://accessories.us.dell.com/sna/p...&mfgpid=157951
This is the docking station I have. The main reason for it is that I have a power on/off switch I can mount anywhere in my car to it and the laptop can be removed with the push of a button from the car in the winter (I live in canada it gets cold here).
Im pretty sure I will be going with the CarNetix CNX-P2140 after reading up on it a bit. And with that I'll be able to wire the docking station and the xenarc screen. As for the dell car power supply... I haven't seen this, can you link this please?