It seems like more and more people are having this problem. I have a 14' Sierra All Terrain and am having the same problesm with moisture/fogging at the bottom where the LEDs are. Noticed right after i got my truck and called the dealereship up and they replaced them the following week. The new set they installed had noticable fogging the following day. I live in south Ga where humidity is a constant problem. Guess ill just have to deal with it until GM decides to do something about fixing this.