Answers

2015-05-15T17:13:24+05:30
It's actually not that common but the REASON behind it is usually traction or load carrying ability. Wider tires tend to achieve more traction than narrow, which is important on a rear wheel drive vehicle, and if it's a sporty truck/SUV, it's partly for aesthetics too to look more sports oriented. 
If you're referring to trucks with dual rear wheels, that's typically just to handle heavier loads...
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