Hello all---spent the weekend getting more stuff ready for 1st trip in my NTM pup. Stock mattresses are just too hard, so I put the anti-fatigue mats under the stock mattresses & purchased 2.5 inch foam toppers to put on top--super comfy. Problem now is the pup won't close with the toppers on. Has anyone used inflatable mattress/pads under foam toppers and just gotten rid of the stock mattresses? Was that comfy & also supportive for aging back & hips? I really don't want to have to put in/pull off the mattresses toppers every time to set-up & close--ack! I was bummed.