[Gegrad]

I replaced ours with the pillow top of an extra queen mattress we had. It fit amazingly in our old passport. I swapped the old RV mattress back into it before I sold it and put the same pillow top in our Premier. It is a little long for the space in the Premier, so shimmying by the end is a little tighter, but it is well worth the it for the comfort. The plywood support underneath is just as good as it being on a box spring. I actually built a slight longer support and replaced the original support to provide slight more support, but otherwise it has been a godsend.