We have 30K of almost always hauling a heavy truck camper, heavy fifth wheel, or heavy boat. I inspected my pads a few weeks ago when swapping tires and they were in great shape with probably 70% life left. Rotors look new.
I change brake fluid every couple years, when I tackle other maintenance that has me under there anyway.
We use the EB more than the service brakes, so that might make a big difference. Regardless, I doubt you need to worry too much about it right now, but ask the service center to take a look next time you have the tires rotated.
I've always run either OE, or EBC brakes.