what are people using for a camping mattress, for those of you that sleep in the back? I had these bamboo mattresses that were great but they got very packed down and are super uncomfortable now. I'm not currently planning on doing a raised platform build. I usually keep the passenger side rear seat set up as a seat while driving, because that's where my dog likes to sit. She's too tall to sit on the mattress if I had full mattress back there full time on a raised platform. hell, she's almost too tall with the seatback down with no pad on it. I need something pretty comfortable, as I'm only about 2 months out from 5 broken ribs and sleeping on anything hard is super uncomfortable.