<P> While in the United States and Canada most pickup trucks are used primarily for passenger transport, agriculture, and commercial uses, pickups are also used in law enforcement, the military, fire services, and for pickup truck racing, a form of auto racing using modified versions of pickups mostly on oval tracks . Race pickup trucks are mechanically similar to coupé - shaped stock cars . </P> <P> A monster truck is a vehicle styled after pickup trucks, but with extremely large wheels and suspension . They are used for competition and popular sports entertainment and in some cases they are featured alongside motocross races, mud bogging, tractor pulls and car - eating robots . </P> <P> Equipping pickup trucks with camper shells provides a small living space for camping . Slide - in truck campers, on the other hand, give a pickup truck the amenities of a small motorhome, but still allow the operator the option of removal and independent use of the vehicle . </P> <P> Some diesel engined pickups are modified to produce more diesel exhaust and have been described as rolling coal . Changes are designed to produce visibly polluting sooty emissions and include the intentional removal of the particulate filter, as well as installing smoke switches and smoke stacks . Modifications may cost from $2,000 to $5,000 . </P>

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