These are trucks that have been modified to use enormous tires and are generally only driven recreationally. We review them and the different modification methods needed to turn a regular vehicle into a monster truck easily and with style. A monster truck is a customized vehicle with a heavy-duty suspension, four-wheel steering, and enormous tires built for competition and entertainment. They progressed from modified stock pickup trucks and sport utility vehicles (SUVs) to purpose-built automobiles with tube-frame chassis and fiberglass bodywork rather than metal bodies. A competitive monster truck is usually 12 feet tall (3.7 meters) and has 66-inch (1.7-meter) off-road tires. Monster trucks first gained popularity as side acts at major motocross, tractor pulling, and mud bogging events in the late 1970s and early 1980s, where they were utilized in car-crushing exhibitions. Today, they are generally the major attraction, with motocross, mud bogging, ATV racing, and demolition derbies serving as sideshows. A racing and a free stunt driving competition are usually the two primary attractions at monster truck shows. The races are held in a single-elimination competition on short, symmetrical circuits with obstacles like trash vehicles and dirt mounds. The length and intricacy of the track varies depending on the size of the venue, with indoor arena courses being shorter and having fewer obstacles. The original monster trucks were modified pickup trucks and SUVs with a higher suspension and bigger tires. Trucks now feature custom-built tubular chassis with four-link suspension for up to four feet of clearance, as well as fiberglass bodies that attach to the chassis individually and are meant to be removed and changed quickly.