........all of our trucks carry between 500-1000lbs on a daily basis and I generated my own fleet maintenance schedule for drivers to follow.
Here is a sample of some of our service intervals.....
Oil change intervals are every 6000-8000km's
Transmission service intervals - every 70,000km's
Rear diff inspection and service (if required) - every 50,000km
Air filters - every 25,000km
tune-up (plugs) every 100,000km
.........I don't know what I can do to prevent these timing chains from breaking though????? And like I said - The replacement timing chain is thicker/stronger looking than the original. Not sure what the 2012's and 13's will have???