Introduction
Picture this: a fully loaded trailer sits at your dock, ready to ship, but there's no truck available to pull it. Your product isn't moving. Your customer is waiting, and your team is scrambling to find capacity.
This capacity gap costs shippers time and money every single day. Power only trucking solves it by separating the trailer from the truck that hauls it.
This isn't a niche workaround anymore. Knight-Swift Logistics reported that power only moves made up 30% of its Q3 2020 truckload volume, an 87% jump from the previous year. Shippers are catching on fast.
Below, we'll break down how power only trucking works, which trailers it supports, and how it stacks up against traditional truckload service.
Key Takeaways
- Power only trucking supplies the tractor and driver only — the shipper owns the trailer
- Pre-loaded trailers cut dwell time and speed up turnaround compared to live loading
- Shippers gain flexibility to scale capacity up or down without buying more trucks
- Dry van, reefer, flatbed, and container trailers all move under power only arrangements
- Working with a broker network simplifies sourcing reliable power only capacity
What Is Power Only Trucking?
Power only trucking is an arrangement where the carrier supplies just the tractor and driver. The shipper, broker, or a third party owns and controls the trailer, which arrives pre-loaded and ready to move.
Compare that to standard truckload service. There, one carrier provides the whole package: tractor, trailer, and driver, all bundled into a single transaction. You're renting the entire rig, not just the horsepower.
That's actually where the name comes from. The carrier isn't supplying the trailer, the freight, or the loading dock. It's only supplying the power unit — the tractor that pulls the load from point A to point B.
This distinction matters because it shifts asset ownership. Instead of depending entirely on a carrier's trailer fleet, shippers who use power only arrangements keep control over their own equipment, scheduling, and loading pace.
Key Power Only Trucking Terms to Know
Getting comfortable with the terminology makes it easier to work with carriers and brokers. Here's a quick reference:
- Power unit – The tractor that provides motive power for the trailer
- Drop-and-hook – The process of dropping one trailer at a facility and hooking to another already staged there
- Trailer interchange agreement – A written agreement (governed under 49 CFR 376.31) that spells out liability, insurance, and terms for hauling equipment the carrier doesn't own
- Trailer pool – A group of trailers positioned at one location for carriers to pick up as needed
- Load board – An online marketplace where carriers and shippers post or search for available freight and capacity
Knowing this vocabulary pays off when negotiating trailer interchange agreements or comparing quotes from multiple carriers. For example, a retailer running its own trailer pool can request power only service for every outbound load, cutting reliance on a single carrier's equipment.
How Does Power Only Trucking Work?
The process runs in a predictable sequence, and it's built around minimizing wait time at both ends.
- The trailer gets staged. The shipper or 3PL pre-loads the trailer at the facility so it's sitting ready before the truck even shows up.
- The driver hooks up. A power only carrier arrives with just the tractor, connects to the trailer via the fifth-wheel, and hits the road. No waiting around for loading.
- A trailer interchange agreement kicks in. This document covers liability, insurance, and usage terms since the carrier is hauling equipment it doesn't own.
- The trailer gets delivered. The carrier drops it at the destination and can immediately grab another load or trailer instead of sitting idle.
Why Drop-and-Hook Cuts Wait Time
This drop-and-hook approach is common in power only shipping, but the two aren't identical: power only describes who supplies the equipment, while drop-and-hook describes how trailers get swapped.
The time savings, though, are real. DAT notes that live loads typically take around two hours each. Drop-and-hook skips most of that wait entirely.
That gap adds up. FMCSA research found that detention happens at roughly 1 in 10 stops, averaging 1.4 hours beyond the standard loading window. Every hour a driver sits at a dock is an hour they're not earning or moving freight — which is exactly the dead time power only arrangements are designed to eliminate.
Types of Trailers Used in Power Only Shipping
Power only isn't limited to one trailer style. The most common types include:
- Dry van – Standard enclosed trailers for general freight
- Refrigerated (reefer) – Temperature-controlled units for food, beverage, and pharma
- Flatbed – Open-deck trailers for oversized or irregularly shaped loads
- Shipping containers – Intermodal units moving between ports, rail, and final destination
Trailer type directly affects which drivers and carriers you need. Reefer freight demands drivers who understand temperature monitoring and unit maintenance. Flatbed loads require securement expertise, since drivers must properly distribute and inspect cargo under federal regulations.
Some loads go beyond these standard categories entirely. Oversized freight, specialized equipment, and non-standard trailers require heavy haul expertise that not every carrier has. These shipments call for carriers with owned specialized equipment and proven experience serving industries like aerospace, defense, and material handling, where a standard dry van won't cut it.
Benefits of Power Only Trucking for Shippers
Shippers turn to power only for reasons that go well beyond convenience:
- Cost savings — you pay only for the transportation leg, not tractor ownership, maintenance, fuel, or driver-related insurance
- Faster turnaround — pre-loaded trailers mean drivers aren't waiting at your dock, so hookups happen quicker and deliveries stay on time
- Scalability without capital investment — add trucks during peak season or a demand spike without buying equipment or hiring drivers
- More control over equipment — you manage your own trailer fleet and scheduling instead of relying on a carrier's availability
- Access to specialized drivers — carriers focused on power only freight often have operators experienced across multiple trailer types and handling requirements
Sourcing this kind of capacity is the tricky part, though. That's where partnering with an experienced logistics broker pays off. Instead of juggling multiple load boards yourself, one relationship with a broker backed by a strong carrier network and real-time tracking technology gets you access to vetted power only capacity when you need it.
Power Only Trucking vs. Traditional Truckload Shipping
Both models move freight, but they solve different problems.
| Factor | Power Only | Traditional Truckload |
|---|---|---|
| Assets supplied | Tractor and driver | Tractor, trailer, and driver |
| Trailer ownership | Shipper or broker | Carrier |
| Best for | Shippers with existing trailer fleets or fluctuating volume | Shippers without trailers, wanting an all-in-one solution |
| Flexibility | High: swap carriers without swapping trailers | Lower: tied to carrier's equipment |
| Setup complexity | Requires trailer interchange agreements | Simpler, single-carrier contract |
Traditional truckload is comprehensive. One carrier, one contract, everything handled. But that convenience often comes with a higher price tag and less flexibility, since you're locked into whatever equipment that carrier has available.
Power only shifts trailer ownership to the shipper's side. If you already have trailers sitting around, or need volume flexibility that a fixed carrier relationship can't provide, this model usually reduces costs and lets you choose equipment tailored to your freight.
Here's how to decide:
- You own trailers or face seasonal volume swings: power only likely reduces costs and adds flexibility
- You have no trailers and want one straightforward contract: traditional truckload is the simpler choice
Why Partner with Sims Global Solutions for Power Only Freight
Sourcing reliable power only capacity isn't always straightforward. Many brokerages simply don't have the reach to fill these loads consistently.
Sims Global Solutions combines owned trucking assets with a broker network spanning over 150,000 carriers. That hybrid model gives shippers access to capacity that a purely brokerage-based competitor often struggles to secure, especially during tight capacity cycles.
A few things that set the partnership apart:
- SimsTrak TMS – Provides real-time tracking and streamlined documentation, so you always know where your trailer is
- Dedicated operations team – Handles execution across multiple freight modes, not just power only
- 24/7 agent support – Someone's available whenever a shipment needs attention
- Multi-modal flexibility – TL, LTL, drayage, and warehousing support alongside power only freight, so you're not managing five different vendors
For shippers juggling fluctuating volume or seasonal spikes, having one partner who can flex across service types simplifies the whole operation.
Frequently Asked Questions
What is a power only load?
A power only load is freight where the carrier supplies just the tractor and driver to haul a trailer that's already owned and pre-loaded by the shipper. The carrier never touches the loading process.
Is power only trucking worth it?
It's often worth it for shippers with existing trailer fleets or fluctuating volume, since it cuts equipment costs while adding flexibility. That said, factor in trailer availability and potential dwell time before committing.
Which load board is best for power only loads?
DAT and Truckstop are popular platforms for finding power only freight. Working with an experienced freight broker can simplify sourcing without requiring you to manage multiple load board accounts.
What is the difference between power only and drop-and-hook trucking?
Power only refers to the carrier supplying just the tractor, while drop-and-hook describes the process of swapping trailers at a facility. They often overlap, but they're not the same thing.
What trailer types work best for power only shipping?
Dry van, reefer, flatbed, and shipping containers are the most common trailer types used. Trailer condition and readiness for pickup matter more than the specific type for a smooth handoff.
How can shippers get started with power only trucking?
Start by assessing your trailer fleet and volume needs. From there, partner with an experienced broker or carrier network to source reliable power only capacity without added guesswork.
