I'm not familiar with the mattress brand, but it sounds like an air mattress where each side can be set to a different pressure, like a Sleep Number Bed.
If you take the top of the mattress off (probably a zipper of some sort) so that you can see the individual air chambers inside you'll find some sort of a support between the two chambers. I'd expect it to be some sort of foam, and it's probably worn out and needs to be replaced - just the foam in between the air chambers, not the entire mattress.
You can probably find something suitable at a local hobby store.
Get the best/firmest foam you can buy, otherwise it'll be too soft and you still have the same problem.
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2013 Winnebago Sightseer 36V
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