Ok.here is my first contribution to the list.  I bet that I will be
asking for more info than I will be getting.

I pulled the custom install front door speakers from my 84 camper and
turns out both were "corroded" through.  I guess the vent system on
these rigs runs a constant stream of air through the door and "eats
away" at the speaker material.  I think that I will install baffles on
the back of the speakers (Crutchfield sells them) to help protect them.

Anyway if you are thinking of ripping off the map pouch on the drivers
door and installing some rad 6" speakers, consider dealing with this.

Cheers

Philip