Every 2 months, I have replaced my brake pads & rotors,

Top quality parts installed?... REAR brakes doing their job to assist the front brakes??... Also... Your driving habits/conditions are unknown!!

Definitely check to see that rear brakes and adjusters are working correctly. Also if you are pulling a trailer make sure its brakes are working correctly. Use a lower gear (even if you have an automatic) if you need your brakes on long downgrades. Check for stuck or sticking calipers. In two wheel drive if the calipers are not at the proper angle vs the wheel spindle it could lead to improper ware and overheating. If its a four wheeler could there be some kind of out of round problem from the drive shafts on the front wheels causing rotor overheating. Suck or sticking calipers can also quickly cause rotors to overheat causing the rotors to warp. Onced warped due to overheating they can only get worse. ABS is antilock braking system. If you have to ask the name of it its probably to complicated for you to replace it. Its a small but expensive box near the master cylinder. It has five steel tubes two to the master cylinder and three to the brake cylinders/calipers. When you turn on you truck before stating you should see a yellow ABS light. No light means a bad bulb or a disconnected one.