Our sofa bed had an air mattress, but we always thought it was awkward to take down during the day when we need it multiple days. The wife ordered a mattress that folds in thirds and it is both more convenient and more comfortable.
she got it online, but I don't know where from - probably through Amazon, though.
35 miles from Normal, IL. As close to normal as I'll ever be.
2006 Country Coach Inspire Genoa 40ft