This is mostly on buses and short nose trucks. In long nose trucks, the steering is fully adjustable, like in a car, but still has a fairly large wheel in case the engine stalls and you find yourself out of gear and can’t get back in. The angle depends on how much room you have & where the steering gears are located. The size of the wheel is so you can get extra leverage to turn without power steering and the even larger wheels are for those without power steering at all.
Source: Got a company truck that liked to stall and was without power steering a few times.
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