Mostly common in racing series such as NASCAR and Formula 1 (aka F1). This happens on some tracks during races where the cars are close together and drivers misjudge how close the cars are. Thus, resulting in one big wreck after another. It can also result in only a few cars being taken out of the race instead of seven cars at once.
Did you watch the race on TV yesterday? It was a freakin' wreck fest out there!
A type of RV, like a pull trailer except the hitch or pin box is over the hook up that is in the bed of a pick up truck. Like a Silverado 2500 or 3500 HD or a Superduty. A fifth wheel evenly distributes its weight over the trucks rear wheels, making the ride smoother. There are many manufactures that offer fifth wheels with different floorplans and can vary greatly in prices and lengths. You need to buy the hitch adapter for hook up after you buy the truck. It can be bolted on or welded on. Unlike pull trailers, fifth wheels will not sway.
I bought a new truck and fifth wheel to go on vacation with.