We feel the same way about RV beds. I asked a salesman why they put such poor mattresses in RV's & he said that they do because most people throw them away & buy the mattress that they like. Our's is boarder line but I may replace. Same way with boats. I have a Sea Ray cruiser ($$$) & the permanent bed has a mattress that is close to those used in pop up campers. Go figure.
2011 Itasca Suncruiser, Jeep Grand Cherokee toad
MSgt retired USAF 1988, AA retired 2005