If there is no water damage, then the soft spot is probably just the wear because there is a wide gap between frame supports.
Again, if there is no water damage, the fix is done under the floor. Remove the underbelly and add support from under the floor. Don't rip up the floor from the top side or you'll really be opening a can of worms. You'll have to match the thickness of the original floor, you'll have to splice it at the frame supports, and that in itself will cause the new section to be weaker than what you have now. Plus, you'll now have seams in the top floor covering (vinyl or carpet, which ever you have).
Do it from underneath. You can probably do this yourself without disturbing anything inside the camper so you can continue living in it undisturbed.
All you need to do is add some 2x4's wedged up tight against the floor (on the bottom side), or if you can, weld or bolt metal supports between the existing one, making more and new cross memebers.
(That's what I'd do) ... provided there is no water damage!
Welcome to the forums and hope you have many happy travel adventures in your journeys.
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2019 Montana High Country 375FL
2014 Chevy Silverado Duramax, 6.6L Dually
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