A couple of times I gave up the steering wheel and I got in the back seat for a short nap (on long hauls of 10-12 hours). I find the back seat a bit uncomfortable because of the rough suspension. You hear and feel a lot the road hazards. I presume that a SUV is not as comfortable as a sedan, and the fact that the cargo space is not separated is not helping.
Although, no problem for leg space for me (6'2''), nor the firm seat. I did have problems hearing the front seat people, but mostly because of my small hearing problem, the radio and the distance from them

, not the outside noice.
PS. It's an Equinox experience.