You would think, that an option like that on a truck (that has a bulb cost of 40.00+ on a GM website) would have some kind of a lifetime warranty. Are you guys in "cold climates"? Maybe the SMD LED lights can't handle the season changes, just a thought.
I would have to say a watertight seal around the lamp housing and dielectric grease on contacts, should give many years of trouble free operation. Unless there is a significant wiring issue.