we were just faced with replacing our air mattress in our ’16 suncruiser. we wanted to dump the air mattress in favor of a solid mattress so i called about half-a-dozen companies starting with Tuft and Needle. after describing the conditions to which the mattress would be subjected all of the companies i spoke with were willing to sell us a mattress but none were willing to provide a warranty. we're on the road roughly 5-mos a year and were concerned about a std mattress holding up to the stress of a daily extending/retracting and 4+ months of being stored in the retracted position. so we opted for a new air mattress. i wish we had seen your post 2-months ago.
2016 Itasca Suncruiser 38Q