I feel your pain. Both knees toast. Failed replacement and uncontrollable neuropathic pain.
I have been going around in circles with this for five years, to the point of depression.
I can’t help with the tent, but spent big $$ on big Agnes sleep pad and sleeping bag, part of their sleep system, and at least I am getting a decent sleep.
In the end I spent time with an occupational psychology therapist who was pretty blunt and direct. Basically, if you HAD to do a certain thing, in our case sleep in a tent, and you had no choice, could you do it.
The answer is probably yes. It’s gunna hurt, but it hurts anyway. It’s just the depth that varies. She made me watch the attached video from Life is Beautiful.
It’s hard, but changing my mindset, or accepting that pain is just pain, has let me ride Java for two weeks, and travel Japan in a tiny Kei Truck.
I have to lay down to get changed, roll out of my tent, and sit on my butt to pack things away etc. I am off for three weeks riding and camping in Japan
But I can do it. Perhaps rather than a different tent, it’s a different mindset.
It’s ok to tell me to %#$% myself lol.
https://youtu.be/dvtAUT6g6j4?si=nU3UIrWYwvsfFTAx