I toured the Riverside Fleetwood factory back in 1996, before buying my Bounder. It was a fun tour.
They mentioned there is a strip going down each sidewall to roof mount location, it is removeable, and where I installed new wiring for a rear camera, and other devices.
For my satellite TV system, I drilled a hole into the center of my roof, and ran the wiring in the air duct that runs front to back, for the A/C unit. I also knew that should the wiring hole leak, the water would go into the air duct, and leak out the ductwork, not damage the ceiling (it did while on vacation once). And the duct went into the ceiling above the TV set, so it was fairly easy to make a 1" hole to pull the wires out above the TV set and run them over to the satellite controller. The 1" hole leaks cold air into the space above the TV, a good thing IMHO.
You will probably find that the covers clip onto the speaker metal rim. Once off, there should be 3 or 4 screws that hold the speaker into the wall, and above it should be a cavity where the factory installed the speaker wires during construction.
If you need to fish in a additional wire, you should be able to use a clothes hanger or something to push it through the styrofoam? You can also cut it with a knife that has a long blade. If the blade is 12", and you can get at it from both sides, or can go from a air vent towards the location, then from say the open speaker hole get into the same new hole, you can make a new conduit that is about 2' long, and perhaps use a coat hanger to connect two 9" - 12" long holes together with a 6-9" long solid styrfoam space making the hole open with some coat hangers. Just don't poke through the roofing 3/8" plywood by mistake! LOL.
Fred.
Money can't buy happiness but somehow it's more comfortable to cry in a
Porsche or Country Coach!
If there's a WILL, I want to be in it!
I havn't been everywhere, but it's on my list.
Kangen.com Alkaline waterEscapees.com