HI, I have a 2007 F150 FX4, and at almost every oil change interval I have had to get the rotors either changed or turned (under warrantee phew!). Is this normal? I dont brake hard, and I pull a boat in the summer, but it is not a heavy boat, about 1200 pounds-boat, motor, trailer and gear.

I guess on the up side, I have just under 40,000km on it, and have new rotors all around!!