I bought a 2018 Chevy Silverado 3500 LB duramax with 86,000 miles today and I am new to duramax motors. I know to put fuel additives when I fill up. Along with using shell rottella oil and changing the fuel filter every oil change along with plugging in the truck in the winter. The truck will be used to pull a fifthwheel occasionally which I am looking at the 20,000 pound and under range. The rest of the time the truck will be used for daily driving. What problems have y’all had and what else are y’all doing to take care of your trucks?