Those unusual types of pickup trucks are those that have been lifted up on four ultra-large, super-sized wheels. They are the most iconic, memorable type of pickup trucks, and they were popularized in the 1980s with radio commercials that featured a loud, booming, echoing, resounding voice and encouraged people to come out to these rallies.
A pickup truck that has been modified this way, though, is not so strange. It's really just a pickup truck with huge wheels and suspension. They're used in competition and as a form of popular sports entertainment, and they are not really driven on the road, but some modified and tweaked cars are driven on the road. These kinds of pickup trucks are seen alongside motocross, mud bugging, tractor pull, and robot fighting, and they often pull out huge crowds that want to see them crushing, running over, demolishing, and breaking other cars.
A super-sized monster truck show is an unforgettable event. They will usually crush the series of smaller cars underneath its gargantuan tires, and the smart cars and other tiny automobiles are totally demolished. Since these trucks can run over most man-made barriers, they are equipped with special Remote Ignition Interruptor switches to prevent any accidents from happening. The audience members have to be kept safe in case a driver loses control of his vehicle. Some events have just one driver, but that's not really as exciting. Most of the events feature two drivers that are racing simultaneously against each other over symmetrical lines of cars. The loser is eliminated in a fashion like a tournament. The losing driver usually has his car completely destroyed with dynamite, fire, a crushing device, or a huge explosion. This adds fuel to the fire, pun intended, of the audience's excitement and engagement with the competition.
In recent times, a lot competitions have closed with a "freestyle" event. It is sort of like figure skating with big pickup trucks, and the drivers are able to select their own course and obstacles to choose from. Drivers will often try "donuts", but these don't work very well. Wheel stands and jumps are also common fare. Other obstacles are sometimes put on the track like school buses and small airplanes.
Pickup trucks that have been modified a little like this are the largest form of pickup trucks there are. They are some of the most massive and indelible trucks you'll ever see, and the impression they leave will linger for a long time. Don't hesitate to go to a large lifted truck show if you ever get the chance.