I've always seen the listed "crew+passengers" figure as the number of available seat commonly used. Any additional passengers must take up cargo space.
Naturally in some vehicles there's no way you're going to "convert" cargo capacity to passenger (take the inside of a tank for example). For others, say a 10 tonne truck, it depends a lot on what body it has installed - eg flatbed or tanker, etc.
As leo suggested, anyone not in a proper seat (or adequate preparations made for them) is going to suffer over time.
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If it moves, shoot it, if not push it, if it still doesn't move, use explosives.
Nothing happens in isolation - it's called "the butterfly effect"
Mors ante pudorem
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