A "truck" is nothing more than an interconnected set of components, primarily the engine, transmission, axles, and frame. Each of these compeonents has an independent life span.
It also depends on the maintenance. For a company "fleet maintained" truck that may have had the oil changed twice a year the engine may not make 500,000 miles. A well maintainted engine may go 1.5 million miles or more before needing an overhaul. I know of several trucks with more than 3 million miles on some parts and one that has more than 7 million miles on it. They last forever if taken care of.
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Nothing is foolproof to a talented fool.
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The Road goes ever on and on
Down from the door where it began.
Now far ahead the Road has gone,
And I must follow, if I can,
Pursuing it with eager feet,
Until it joins some larger way
Where many paths and errands meet.
And whither then? I cannot say.
-- J R R Tolkien
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