In your camping experiences, what have you found to be the best air mattress to buy? I want to get one for the E. There seem to be a lot on the store shelves with little way to compare one with another except for the photos on the boxes. I remember sleeping on these things years ago and having to get up during the night to pump them up, or freezing to death because they were so cold. I imagine the newer ones are of better quality. Anyone have experience they can share or recommendations about what to buy?