If your 25' FB FC is built like the 20' FB FC that I have, there is virtually no way to get to the front, under bed electronics without taking the mattress out, and the plywood off the top to gain access to things. I have had mine apart several times to do the electrical modifications I wanted to do. PITA, but necessary. Removal of the road side "arm" is also needed to get the plywood out. There are screws in the side of the arm, as well as the bottom. Side screws are hard to find.