Beginning the the early 20th century, the 1920's saw several major advancements. There was improvement in rural roads which was significant for the time.The diesel engine, which are 25-40% more efficient than gas engines were also a major breakthrough.We also saw the standardization of truck and trailer sizes along with fifth wheel coupling systems. Additionally power assisted brakes and steering developed. By 1933, all states had some form of varying truck weight regulation.
In 1976, the number one hit on the Billboard chart was "Convoy," a novelty song by C.W. McCall about a convoy of truck drivers evading speed traps and toll booths across America. The song inspired the 1978 action film Convoy directed by Sam Peckinpah. After the film's release, thousands of independent truck drivers went on strike and participated in violent protests during the 1979 energy crisis (although similar strikes had occurred during the 1973 energy crisis).
“Country music scholar Bill Malone has gone so far as to say that trucking songs account for the largest component of work songs in the country music catalog. For a style of music that has, since its commercial inception in the 1920s, drawn attention to the coal man, the steel drivin’ man, the railroad worker, and the cowboy, this certainly speaks volumes about the cultural attraction of the trucker in the American popular consciousness.” — Shane Hamilton
“The association of truckers with cowboys and related myths was perhaps most obvious during the urban-cowboy craze of the late 1970s, a period that saw middle-class urbanites wearing cowboy clothing and patronizing simulated cowboy nightclubs. During this time, at least four truck driver movies appeared, CB radio became popular, and truck drivers were prominently featured in all forms of popular media.” — Lawrence J. Ouellet
During the latter part of the 20th century, we saw a decline of the trucking culture.Coinciding with this decline was a decline of the image of truck drivers, as they becamenegativelystigmatized.As a result of such negativity, it makes sense that truck drivers werefrequentlyportrayed as the "bad guy(s)" in movies.
Heavy trucks. A cement mixer is an example of Class 8 heavy trucks. Heavy trucks are the largest on-road trucks, Class 8. These include vocational applications such as heavy dump trucks, concrete pump trucks, and refuse hauling, as well as ubiquitous long-haul 6×4 and 4x2 tractor units. Road damage and wear increase very rapidly with the axle weight. The axle weight is the truck weight divided by the number of axles, but the actual axle weight depends on the position of the load over the axles. The number of steering axles and the suspension type also influence the amount of the road wear. In many countries with good roads, a six-axle truck may have a maximum weight over 50 tons (49 long tons; 55 short tons).