Power-only is a well-established freight model that most experienced brokers encounter eventually, and a model that some brokers build entire niches around. The core dynamic is simple: the shipper has trailers, the carrier has a truck. Brokers connect them. But the details — liability, carrier qualifications, pricing, and trailer condition — require specific knowledge to execute correctly.
What Power-Only Freight Is
In a standard truckload move, the carrier provides both the tractor and the trailer. The carrier owns and maintains the equipment; the shipper simply has freight to move. In a power-only arrangement, the shipper provides the trailer. The carrier shows up with a tractor and driver, couples to the shipper's trailer, and hauls it to the destination. The carrier's only equipment contribution is the tractor itself — hence "power only."
This model exists because:
- Large shippers, manufacturers, and retailers often own or lease trailer fleets
- They need carriers to move those trailers without giving up control of the equipment
- Trailer pools at high-volume facilities require constant cycling
- A trailer breakdown on the road needs a tractor to rescue the stranded freight without changing the equipment
From a broker's perspective, a power-only load looks similar to a standard TL load on the surface — an origin, a destination, a rate — but the underlying dynamics are different.
When Shippers Need Power-Only Coverage
Trailer pool operations are the most common use case. A manufacturer or retailer parks 30 trailers at their facility. They load trailers on a rolling basis and need carriers to pick up loaded trailers and drop empties. The shipper has invested in the trailer fleet; they need tractor capacity to keep the pool moving. Brokers who cover these accounts source carriers capable of coupling to and moving the shipper's specific trailer type.
Stranded trailer recovery is a time-sensitive power-only scenario. A carrier's tractor breaks down mid-route; the trailer with a full load of freight is now sitting on the side of a highway or in a truck stop lot. The shipper (or original carrier) needs a replacement tractor to recover the freight and complete the delivery. These moves are often urgent and command a premium.
Shipper-managed fleets at large manufacturing operations — automotive, consumer goods, appliances — run continuous power-only programs. Brokers who want this business need to understand that they are bidding to provide tractor capacity, not full truckload service.
Trailer Types in Power-Only Moves
Most power-only freight moves in dry van trailers, the standard 53-foot enclosed trailer. Shipper-owned dry van pools are the most common setup.
Flatbed power-only is an important segment for industrial and manufacturing accounts. A shipper who runs a flatbed trailer pool for steel, lumber, or heavy equipment needs carriers with flatbed experience to handle the load. The carrier must understand the securing and tarping requirements for the specific freight — the carrier is responsible for freight handling even though the trailer is the shipper's.
Refrigerated (reefer) power-only is less common but exists where shippers own refrigerated trailers. The carrier must verify the reefer unit is functioning and understand temperature requirements — liability for temperature excursions during transit falls on the carrier even if they did not own the unit.
Chassis and intermodal containers are a related model: a shipper who has a container they need drayaged from a rail yard to a warehouse needs a carrier with a chassis. The carrier can provide the chassis or use the shipper's — power-only in principle.
Sourcing Power-Only Carriers
Not every carrier handles power-only work, and not every carrier who handles it is equally qualified. The key requirements:
Tractor compatibility. The carrier's tractor must be capable of coupling to the specific trailer. Fifth wheel height, kingpin compatibility, and electrical connections must match. Most modern 5th-wheel tractors can couple to standard trailers without issue, but non-standard equipment requires verification.
FMCSA authority. The carrier must hold active operating authority to transport freight commercially. Towing a customer's trailer does not create a regulatory carve-out — all standard carrier qualification requirements apply. Verify authority, insurance, and safety rating as you would for any TL carrier.
Trailer inspection responsibility. Under FMCSA regulations (49 CFR Part 396), a motor carrier is responsible for ensuring any vehicle they operate — including trailers they do not own — is in safe operating condition. A carrier has the right to refuse a shipper's trailer if it has safety defects. This matters for brokers: if you dispatch a carrier to a power-only pickup and the trailer is unsafe, the carrier can (and should) refuse it. Build a verification step into your pre-dispatch process.
Flatbed-specific requirements. For flatbed power-only, the carrier must provide securement equipment (straps, chains, binders, tarps) and have the experience to properly secure the specific cargo. The shipper provides the trailer; the carrier provides everything needed to make the load road-legal.
Liability in Power-Only Freight
Trailer maintenance liability belongs to the trailer owner — the shipper. If a trailer blows a tire, has a defective door latch, or has structural damage, that is the shipper's responsibility to address before the carrier couples to it.
Cargo liability during transit belongs to the carrier, exactly as in a standard TL move. The Carmack Amendment applies the same way: the carrier accepted the freight in good condition, and the carrier is responsible for delivering it in the same condition. The fact that the trailer is shipper-owned does not change this.
Pre-trip inspection documentation is critical. The carrier should document trailer condition at pickup — dents, damage, tire condition, any existing issues — before coupling. This protects both the carrier and the broker if damage claims arise.
How Power-Only Freight Is Priced
Power-only moves are typically priced comparably to standard TL moves for the same lane. The shipper is providing the trailer, which eliminates trailer depreciation cost for the carrier, but the tractor cost, driver wages, and fuel remain the same. In practice, rates may sit slightly below standard TL on well-established power-only lanes because the carrier has less equipment investment.
Where power-only commands a premium is in emergency recovery scenarios (stranded trailer), non-standard trailer types, or situations where available tractor capacity is tight. A broker sourcing a power-only tractor on a Saturday afternoon for a trailer stranded in a truck stop will pay above-market rates.
Trailer rental comparison: In some cases, a shipper who needs their freight moved but temporarily lacks trailers can rent trailers from a rental company, then book standard TL service. Power-only makes more sense when the shipper already has trailers and wants to maintain control of their equipment inventory — it is not a cost-saving strategy so much as an operational model that matches shipper-owned equipment to available tractor capacity.
Frequently Asked Questions
What carrier qualifications do I need for power-only?
The same qualifications as standard TL: active FMCSA operating authority, adequate cargo and liability insurance (typically $100K cargo, $1M auto liability minimum), satisfactory safety rating, and no active federal out-of-service orders. For flatbed power-only, verify that the carrier has the experience and equipment to properly secure the specific freight type.
How is power-only freight priced?
Power-only rates are generally comparable to standard truckload rates for the same lane and distance. The shipper's trailer ownership reduces the carrier's equipment cost marginally, so some power-only lanes price slightly below equivalent TL. Emergency power-only moves (stranded trailer recovery) price at a significant premium due to urgency and limited available capacity.
Who is responsible if a shipper's trailer has a defect?
The shipper, as trailer owner, is responsible for maintenance. However, the carrier bears responsibility for operating a safe vehicle — if a carrier couples to a trailer with known defects, FMCSA liability for operating unsafe equipment may fall on the carrier. In practice: carriers should pre-inspect shipper trailers, document condition, and refuse unsafe equipment. Brokers should communicate that drivers have the right and responsibility to decline unsafe trailers.
Can I broker power-only on flatbed loads?
Yes. Flatbed power-only is common in industrial freight — steel, lumber, heavy equipment. The shipper provides the flatbed trailer; the carrier provides the tractor, driver, and all securement equipment (chains, straps, binders, tarps). Verify that the carrier is experienced with the specific freight type and has appropriate securement gear before booking.
What's the difference between power-only and a standard TL move?
In a standard TL move, the carrier provides both the tractor and the trailer. In a power-only move, the shipper provides the trailer and the carrier provides only the tractor and driver. All other mechanics — pickup, transit, delivery, cargo liability — are the same. The distinction matters for equipment coordination, carrier qualification, and liability allocation around the trailer itself.