How to Remove Mattress

Our old camper came minus a mattress, no problem there. New one bit of an issue as funds don't allow for a sleep number and we both have different asleep issues. Finally found a furniture store in Colorado, where we picked the camper up, that had futon mattresses with inner springs and bou coups padding. Fit perfectly but went ahead and added 2" memory cool foam topper and it sleeps us great. Difficult finding a thin enough mattress, under 10" to allow ample roll over space, and right firmness or lack there of. Laid on every one in the store before settling on that one. It came rolled and taped so install was easy. Same for memory foam and it included a fitted cover that goes over both parts.