I believe the really expensive bit is the control unit that connects the trailer electrics to the van's can-bus electronics. But I have also read somewhere (can't remember where) that you only really need this if your van has ESP, otherwise any competent sparkie can just connect it up using relays.
A search may thow up some useful threads (but go into advance search and change the date to any date, otherwise you only get threads less than 6 months old).
2017 MY18 Golf R 7.5 Wolfsburg wagon (boring white) delivered 21 Sep 2017, 2008 Octavia vRS wagon 2.0 TFSI 6M (bright yellow), 2006 T5 Transporter van 2.5 TDI 6M (gone but not forgotten).
Bookmarks