The metal floor joist on the Rockwood/Flagstaff trailers are farther apart than I'd like.
I recently helped the guy(he's a big guy), who bought my '06 8315SS, reinforce the floor. In the most used area(kitchen), we installed 1/2" plywood under the original floor. We ran 2"X2" joist, front-to-rear, from one steel joist to the other. Made a big difference. The floor is solid now.
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