I believe the cushions on the sofa are as thick as the bed matresses.
I am six foot two inches tall and weigh 276 lbs. I sleep well on our queen size bed in our new 2720. If you search the form you will see some prefer using a 1 1/2" or 2" memory foam matress in addition to provided matress.
That's my two cents!
Welcome to the form. It is money well spent.
Midwest Dave
Quad Cities USA