Bought from Foambymail.com.
They were very helpful on the phone. I recently called for softer samples so I know what I am going to replace with.
Hi - we want to put pneumatic struts under our bed, also. Did you figure this out on your own or was there somewhere you went to for instruction?Not sure what to advise here. We converted ours to a full time bed with a memory foam topper over the stock cushions. We don't miss not having the sofa, as we're either outside or sitting at the dinnette.
I did install an interior baggage door to access the space under the bed from the inside, put a large bin there. A topper may fit in it if it's not too thick. See https://alinerownersclub.org/diy/interior-door/
That door turned out to be redundant when we made the bed permanent with pneumatic struts allowing the whole bed to lift up for underbed access, but it may be a solution for you.