I've noticed the same thing with mine. No clue what causes it. I replaced rear brakes after having the truck for 6 months or so (This February, iirc). The fronts were, I believe, replaced before I bought it. By the time I got inspected in August, my rear pads had less life left than my fronts. Really weird.
That thing is huge!Upgraded my HU today. Installed an Auto Pumpkin 10.1" setup that fits in a double din slot. So far works great. Still have some more things to do (it was ungodly cold here today) to get it completed, but done for the most part. I bought a new harness to go with this as well and went a different route than the typical crimping and/or soldering done in past jobs and pinned all the wires and disconnects with weatherpacks.
https://photos.app.goo.gl/9jkHoQBBMdt1iJmw1
https://photos.app.goo.gl/i7LeerefhXAkzKlk1
https://photos.app.goo.gl/OcJoC3Jyit9iDtlr2
https://photos.app.goo.gl/9f9KHMYfkk9EJOzk2
wow, super nice!...whats the make...and how much did it set you back?