I currently do not see that any manufactures a trailer hitch receiver for your 2016 Fiat 500X Trekking edition. We do have the Weld-On Receiver # E17 that you can take to a local fabrication shop to see about a custom fabricated receiver.
The 4-Way Harness # C59236 will allow you to splice into your factory wiring. This 4-way is the common connector on most small trailer and will also allow for Auxiliary Lights # C53201 should you have a hitch mounted accessory like a bike rack which... view full answer...