From the pic in your signature, that's a whole lotta camper and trailer.
An exhaust brake will fix your problems if you use it correctly.
However unless that 10kmi was all fully loaded and all steep hills, something else is the problem Imo. Even then, are you riding brakes downhill, starting too fast at the top?
How many times have you "warped" the front rotors? First time in this short of mileage ?
Are the rears and trailer brakes working properly? You live in one of the rustiest states with a 12 year old truck. I'd make sure the rest of the brakes are prefect or your front brakes will take the brunt of it.
I've run a few older super duty trucks as construction trucks in the Rockies and brakes seemed stout to me.