As you increase a vehicle's height three things happen
- There is a danger the the top will hit low objects (bridges, tree branches etc)
- The centre of gravity for the vehicle rises too, which means that the vehicle may tip over when going round a bend fast.
- The vehicle will become susceptible to cross winds that may blow the vehicle over.
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The height of the vehicle is kept low as possible to lower their centre of gravity and help to increase its stability
