What is an adequate non traditional mattress base for a full size 3"-4" memory foam topper. I want to be able to roll up the topper, set aside and lean the bed frame against the CT wall for more room during the day so was wondering if there is a thin type of mattress or maybe somewhat stiff foam pad that could stay with the frame and have adequate support for the topper. My back is done with air mattresses and misses the years I slept on mem. foam.