I sleep the best in my TT on the 5 inches of foam bed. That is all the bed in this 22 year old TT had for a bed. No springs, no real mattress, just straight 5 inches of foam.
I did replace the foam with new a couple of years ago though.
I have considered throwing my home bed away and doing the same thing in the house.
I also have trouble convincing people to leave my home reclining chair alone too. The come over set down in it and tell me it's to hard. Then they give me a old one of their chairs and tell me it's much better because it's so soft. After about a hour of setting in some soft chair my back begins to hurt. I wonder how many people have back problems, especially in there later years, because they set in too soft and a poorly designed chair or bed in their youth.
I want something firm for both a bed and chair and in a chair I want to set upright not all slouched over with my back bent in a C shape.
The desk chair I'm setting in right now in front of the computer works good for me. I can set in this chair for hours. I sometimes set here and read a book.