There is a lot of jargon in the RV world. One term you’ll come across, but might not be familiar with, is “fifth wheel” or “5th wheel.” Fifth wheels are a type of towable RV that require a large pickup truck to tow because of the type of hitch they use.
But why are fifth wheel trailers called that? Let’s explore that question, and a few other fifth wheel basics, to help you decide if this is the right type of recreational vehicle for you.
How They Got Their Name – The Fifth Wheel Hitch
Fifth wheels use a U-shaped hitch coupling that’s bolted or welded to the frame of your tow vehicle—usually a pickup truck—through the truck bed. The connection point, also known as a pin box, places the trailer’s weight directly over your tow vehicle’s rear axle.
While hitch technology has come a long way, this basic design is responsible for the fifth wheel name. Old carriages in the 1800s had a horizontal ‘5th wheel’ that allowed the front axle to pivot. The name’s use was continued with the modern-day design for the 5th wheel truck hitch.
It’s similar to the type of hitch used on semi-trucks, which means it’s safe, sturdy, and rated for heavy loads. At the front of the 5th wheel, there’s a “king pin” that locks into the U-shaped pin box in the bed of your truck, allowing you to safely pull the trailer.

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