I got the spray in liner and was thinking of just opting for the floor portion of the bed rug. just to keep the stuff from sliding around and to give padded protection on the floor for tailgating. did not know how it covered the multi pro tailgate.
Boost automotive has a product that does have the mirror lights on with high beam but does not have a way to shut off and on. also some do not like the T-tap connection and would rather use a diode method of this mod.
ya could be the rear window leaking letting moisture inside the cab. Kinda like detailing a vehicle and shampooing the carpet it will condensate on the inside of the windows if not completely dry.
laura buick GMC in Collinsville Ill offers free shuttle from STL airport to dealer. Usually good deals over 700 Sierras in stock on the lot. Largest volume dealer in the country as they advertise.