Yes we went to a mattress store and replaced the existing mattress with a new 4-inch foam mattress. That caused a problem however because the bed would not rise completely to the top, and I could not insert the Locking pins. Initially I ignored that, but while traveling the bed would descend slightly. That's a problem.So I manufactured a small extender using paired 3/8 bolts set into a small extension, and that's worked fine.
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