Maintenance; start with the simple stuff. Checking the fluid levels and the condition of the various fluids in the vehicle is a “must do” maintenance point. You need to change the oil often, especially if you run on the hot side and place higher loads on the tow vehicle. Oil is much better than it was 10 years ago but it doesn’t last forever. It’s cheaper to change the oil than pay a long distance towing bill and/or the cost of overhauling an engine before its time.