I can supply some anecdotally. I own two vehicles with reputations for running after neglected or minimal maintenance: a 1966 VW Beetle and a Land Rover.
The more correct way of characterising both would be that they will continue to run and function without ongoing maintenance (the proper level of which is way above a modern vehicle) until they break in a spectacular and often terminal way.
To attempt to answer your question, I think the general implication is that "old trucks" are designed for high maintenance intervals whereas Land Rovers, especially as used by the military, are designed to perform a function for short intervals with the long-term aid of a logistics chain.