We did the plywood instead of springs and we use a Cal King sleep number mattress. We just let most of the air out before we bring the slide in and the mattress just scrunches up without a problem.
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Dave & Barbara
KenWorth T2000
2005 Mobile Suites 38RL3 #2338
MorRyde IS 8K axles, LazyBoy recliners, LCD tv
Full time since '96
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