Hmmm, surprised they were OEM.
Article in Transport Topics some time back says that fleet service mgrs didn't recommend ceramic pads for heavy service on LDT/MDT size trucks. They were seeing more heat related issues with ceramics than premium grade semi-metalics.
This from brakeperformance.com
The Difference Between Semi Metallic and Ceramic Brake Pads
When deciding what brake pads are best for your vehicle, there are many factors to consider. The type of driving, weight of your vehicle and what is recommended by the manufacturer. Premium semi metallic brake pads
are perfect for all light, medium to heavy duty cars, trucks, and SUV's. This type of pad is highly recommended for heavy work trucks, towing applications, performance vehicles, European vehicles and any vehicles experiencing warped brake rotor/discs due to excessive heat. These pads are manufactured with a high temperature fade resistance and a high friction level. They are simply the best pads for handling high heat and providing noise free braking. Ceramic brake pads
are ideal for medium to light duty US Domestic, Japanese/Korean, Cars, Trucks and SUV's. These Pads are designed to wear longer and have less brake dust than the semi metallic pads
. Ceramic pads
are NOT recommended for heavy cars, trucks, SUV's or performance vehicles because they do not have a high temperature fade resistance and could warp rotors because of the heat factor. Both types of pads will give you great stopping performance and the information provided hopefully will help you make the correct decision.