<Li> Conventional cabs are the most common in North America and Australia, and are known in the UK as "American cabs" and in the Netherlands as "torpedo cabs". The driver is seated behind the engine, as in most passenger cars or pickup trucks . Many new cabs are very streamlined, with a sloped hood and other features to lower drag . </Li> <Li> Cab beside engine designs also exist, but are rather rare and are mainly used inside shipping yards, or other specialist uses that require the vehicle to carry long loads such as pipes, metal rods, flat iron and other construction materials . This type is often custom made from a regular cabover truck that gets the upper half of its cab removed on the passenger side and replaced by an extended section of the bed . </Li> <P> A further step from this is the side loading forklift that can be described as a specially fabricated vehicle with the same properties as a truck of this type, in addition to the ability to pick up its own load . </P> <P> Most small trucks such as sport utility vehicles (SUVs) or pickups, and even light medium - duty trucks in North America, China, and Russia use gasoline engines (petrol engines), but many diesel engined models are now being produced . Most of the heavier trucks use four - stroke diesel engines with a turbocharger and intercooler . Huge off - highway trucks use locomotive - type engines such as a V12 Detroit Diesel two stroke engine . Diesel engines are becoming the engine of choice for trucks ranging from class 3 to 8 GVWs . A large proportion of refuse trucks in the United States employ CNG (compressed natural gas) engines for their low fuel cost and reduced carbon emissions . </P>

Parts of a semi truck body by name