RE: inflatable seat cushions?
Yes, I use a little webbed seat with a green aluminimum frame. It is very very comfortable and the front legs are longer than the back so it puts your back right up against the tree and because you are slightly off the ground, you can sit a long time without having a rock jabbing you in the butt and putting your legs and butt to sleep. I never did find a cusion for the ground that worked so I was happy to find this seat.