Re: 2014 Overland "Parksense" and trailers
The manual (page 39) shows 4 buttons, from L to R: Parksense Off, Forward Collision Off, ECO On, Stability Control Off. The next page describes the front & rear parksense sensors, as well as the button to turn them off.
The marketing brochure has an interior photo of the Summit -- it shows four buttons. Now I'm starting to think the buttons really are missing.