More than 1 spare is very understandable. 6 spares? Probably overkill.
For you, having a blowout means an inconvenience while waiting for AAA.
For them, a blowout means less time to get to destination. 2 blowouts would maybe put the cargo at risk. If they don’t deliver to destination within the time window, they could stand to lose many thousands of dollars.
You might be thinking of lift axles – axles that can be raised or lowered depending on the situation.
They affect turning radius, traction, weight capacity and distribution, and to some degree fuel efficiency and of course the tire wear depending on whether they’re raised up or lowered so that the tires contact the road.
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