As just about all of us have read here, certain models of WW trailers have defects that have resulted in a number of different problems. To one degree or another, this subject has come up on this for...
How to remove the sag out of the roof of a 2007 FS2500 Color code the wires
Pull the wires through the rafters...Notice the sag under angle iron.
wires are now out of the way
Install the angle iron
Re-thread the wires through the angle iron and rafters
I decided against using 3/4 plywood and went with 1/2 BC. The day is done. layed the plywood down temporarily and now I start doing some fun stuff like wire in my PC into the stereo system. and run some inverter wires.