Much comes down to how the vehicle is used, and how hard it's used. A truck used to heavy towing with high-number axles and no OD is likely to work less hard, but turn more revs.
I didn't say having OD, not having OD, etc. has "nothing" to do with this, I AM saying it is not neccessarily a determinator of engine life.
Hour meter readings aren't always reliable either. In our Deere shop, many crawler-dozers only last 3000-4000 hours before an inframe rebuild was needed. But, farm tractors that tended to see more steady loads often lasted 10,000 hours.
This is why the system of "gallons used in a lifetime" is becoming more popular with heavy use engines. An engine worked easy uses less fuel. Worked hard it uses more. An engine on a genset might spend much of it's life running in standy-mode with no load on it etc. An hour meter with 5000 hours can be 4000 hours of hard work for one, and 4000 hours of doing nothing for another.
One problem with the "gallons in a lifetime" is, there is usually no way to know what a vehicle or engine has used. It's more used for engine companies to predict engine life instead of the B-number system.
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