Floor repair in a camper

[weedeater]

trailers are built from frame to floor to walls to roof meaning they deck the trailer frame completely then build walls on top of the floor so the sheating runs under the walls. The best way to fix it would be to remove carpet in that area then take a skill saw and just cut back past soft sheathing to good wood and scab a few brace boards under neath and lay new sheathing back on top, Should be 3/4" thick. This is how I would do it atleast and it worked last time.