I have a 2008 North Trail 28BHS travel trailer that has developed a significant soft spot in the kitchen floor. There is no visible evidence looking at the underbelly of any leaks. The soft spot is in the very center of the floor from side to side in a line with the LED display of the half-time oven and the heat vent that exits the bench at the kitchen table. Any thoughts on what the cause may be or what I should do to inspect the damaged area? I am not sure what material (wood or otherwise) is used for floor support under the OSB or plywood.