Fifth Wheel
A horseshoe-shaped coupling device mounted on the rear frame of a tractor that locks onto a trailer's kingpin, creating the articulated connection between the truck and trailer. The fifth wheel allows the trailer to pivot during turns while securely bearing the trailer's weight. Fifth wheels are greased regularly to reduce friction and prevent wear. There are two main types: fixed-mount fifth wheels bolted in one position, and sliding fifth wheels that can be repositioned forward or backward to adjust weight distribution across axles.
Real-World Example
A driver adjusts the sliding fifth wheel on the tractor forward by 4 inches to shift 800 lbs from the trailer tandems to the drive axles after a weigh station showed the drives were 600 lbs under the limit while the tandems were 200 lbs over.
Why Fifth Wheel Matters for Shippers
Choosing the right equipment directly impacts your freight costs, transit time, and cargo safety. Understanding what a Fifth Wheel is — and when to use one — helps you avoid paying for capacity you do not need, reduces the risk of damage claims, and ensures your shipment meets carrier and regulatory requirements. Shippers who select the correct trailer type on the first try typically save 10-25% compared to those who rebook after a failed pickup.
Common Questions About Fifth Wheel
What types of freight are best suited for a Fifth Wheel?
A Fifth Wheel is designed for specific cargo characteristics — weight, dimensions, temperature sensitivity, or loading requirements. Your freight broker can help you determine whether a Fifth Wheel is the most cost-effective option for your particular shipment or whether an alternative trailer type would work better.
How does choosing a Fifth Wheel affect my shipping cost?
Equipment type is one of the biggest cost drivers in freight. A Fifth Wheel may cost more or less than standard dry van rates depending on availability in your lane, seasonal demand, and any specialized handling requirements. Getting quotes for multiple equipment options is always a good practice.
Can I track my shipment when using a Fifth Wheel?
Yes. Most carriers that operate Fifth Wheel equipment provide GPS-based tracking and real-time ETAs. At Direct Fleet Dispatch, we provide shipment visibility on every load regardless of equipment type, so you always know where your freight is.
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