If you have an access area, look under the shower or bathtub. Or look where the sink drains go through the floor. There is usually a large enough gap between the pipes and the floor you can probably get a cell phone photo and see what the floor is actually made of.
More than likely, it's just a sheet of 1/2 (or less) plywood on top of the trailer frame with flooring on top of that.
I don't know if yours is new enough, but the other style is ... literally .... 1/8 in Luna on top of the frame. 1 and 1/2 inches of Styrofoam board on top of that, and 1/8 inch of Luna on top of that, pressed together. Then your flooring on top of that.
There may be absolutely nothing wrong with your floor. It's possible the distance between the frame support is simply too great. Over time, weight standing on the top of that (in the middle between the frames) simply caused the wood to become for flexible.
It's possible, in an attempt to fix the spongy or bouncy feeling will actually cause you a lot more work and possibly do more damage than it's worth.
If the wood is dry and still feels solid, I would not mess with it. But if you really want to try something, remove the underbelly and simply add extra supports under the floor and do not rip anything up from the inside. Do repairs from "down under" by making extra supports. Also, if you remove the underbelly you'll be able to see if the floor has been subject to water and rot. If not, then add support from underneath if the squishiness is still a concern. If you actually tear into the floor, you may bite off a bigger chew than you can swallow.
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2019 Montana High Country 375FL
2014 Chevy Duramax HD 6.6 - 3500 Diesel Dully Long bed Crew Cab
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