If you’re talking about the rear being wider than the front it’s called a dually. They double up the rims on the rear to increase load capacity, especially for towing. 5th wheel trailers are a common case, the ones with the long neck that anchors in the middle of the bed. They put a lot of weight on the rear axle so it’s good to have extra strength and stability.
If all 4 stick out with big fancy rims and the trucks lifted to look like a baby monster truck, it’s 99% just aesthetic.
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