Hi - buying a 2017 x100D (out of warranty) where seller has full blown hitch package installed. He showed me the wiring harness etc and it has the 2 inch receiver installed. He said he paid a fair bit for this add-on so assumed it wasn't standard in 2017. Then in the manual it states there should be a "trailer mode" in the Driving Controls section but i see nothing there - not even a grayed out option. Has the latest firmware and everything else seems to check out. Any ideas?