It's most likely from not turning off the cold monitoring checks on the tail lights via coding, that contributed to shorter lifespan of a few of the LED's. LED's hate being flicked on and off quickly like they are when bulb checks are ran.

When I installed mine in 2012 I noticed when I started up the car that my tails would "strobe" on startup, even though they did not throw errors and I had the capacitors installed for the adaptive brake light flickering, but that is unrelated. The LCM is checking the bulbs in the tails at startup. (you also wouldn't know this unless you have your garage door shut, or someone is behind you and tells you)

When i had some LCM features coded, I also coded off the bulb checks on the brake/running lights in the tails. 3+ years later, all LED's are good, and no strobing upon startup which will prolong long life for the LED's.

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2018 Ram 2500 6.7L Cummins 68RFE
19k miles -Bright White/Black - Big Horn Sport - Crew Cab Short Bed
2013 X5 35D (CEO's) - Born on 5/17/2013 -
82k miles - Alpine White/Cinnamon Brown/Premium Pkg, Sport Activity/Premium Pkg and Sound/20" Style 214/Running Boards