Travel Trailer with soft spots on the floor

I have fixed a few problems with our floor in the past. The wood was soft...I peeled back the carpet in the front bed area and found that it extended into the front storage compartment. I took out the old wood, used my table saw to cut the new floor joists into the right size, made a box using them to attach into the floor structure. Screwed it in and then attached the new flooring piece. Put the carpet back down and redone the area in the storage area.