We ended up ordering a custom spring mattress (see picture below from their website) for
our vintage Airstream and they made it exactly to Airstream’s diagram.
It’s significantly more comfortable than the crappy mattress that came with
Last Fall we wanted to replace the original mattress that came with our 24′ Arctic Fox fifth wheel. But our bedroom is so small, the only way to do so was to order one that arrives rolled up, which only memory foam can do.