My 2005 Flagstaff had the fold out sofa with bouncy springs and thin foam mattress on top of the spring/frame. The head of the bed was way lower than the foot. So, I built a frame out of 2x4's and set the sofa on top of it. That raised the sofa 3 1/2". Next, I cut a 4x8 piece of 1/4" luan into strips about 48"x18". I used 4 of the strips to put long ways between the springs and foam mattress. That made it a bit more firm. When folding up the sofa I stack the the luan strips on top of each other and put them under the cushions.
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North Carolina born and bred
2010 Sandpiper 345RET
2011 2500 Duramax Silverado
2001 Centurion Elite Bowrider direct drive
"Old water skier"
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