I have a Premium, with second row bench seating. One of the reasons I got an Ascent was that I would be able to put the rear two rows down, and sleep in the back. When I'm on weekend road trips, I'm rarely stopped for more than a few hours, so paying for a hotel is a waste. I went on my first mini trip, from MA to southern NJ last weekend. The back was fine, save for not being totally flat. Does anyone, who has used them before, have any SUV mattress suggestions. Only real requirement is durability, as my large dogs will come on some of the trips. Thank you.