There is the Pett Porta which I have. It does have that knees in your ears problem but when needed, I love it. I know there are others on the Forum with it. An added help is the little plastic hospital bottle for use in a bed. It has saved me many late night stumbles in the cold dark outside. I do have a good privacy tent for over 6ft people. I got most this at the Sportsmans Guild site at very good prices.
And the Campmate Organizer from them should arrive in two days. Thanks for the recommendation from Texas.