We are about to collect our new expanda, and we own a BMW *Try posting a bit more so your post isn't boring*. Jayco have advised us that they can't fit the required trailer connection and that that only an BMW service centre can do this. Called an auto electrician who also said that only BMW can fit the trailer connection and program the software in the vehicle. Apparently once this is done any auto elctrician can fit the electric brakes and controlling unit. Very worried that BMW are going to charge us a fortune to do this. Has anyone else had to do this? Any suggestions?