When we go away with friends, we normally use the sofa air bed. Our friends take the bedroom as they like to sleep in longer than we do. When we first started to use the sofa bed, the first thing we noticed was that the air bed was longer than the sofa was folded out. We woke up in the morning with our pillows and heads sunk down in the hole behind the sofa. Solution, make a collapsible support. We all know these Monty's need lots of mods.
(Just like any other). I used a 48 X 18" piece of 1/4" thick plywood, some furring strips, couple blocks of 2 X 4, couple hinges and a handle. Store it behind the sofa when not in use and fold it out for use when needed. Pics below:
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Weighs only about 5 pounds and well worth the effort to build.
Thought I would post this in case anyone else uses their sofa bed often and had the same problem we had. I'm sure others have come up with their own solutions but this works for us.