Plenty of drivers and small fleet owners look at reefer trucking because the freight pays better. Fewer understand what they're actually signing up for before buying that first refrigerated trailer. The equipment costs more. The maintenance is trickier. The compliance paperwork multiplies.
This guide covers how reefer trucks work, what sizes and configurations exist, the real benefits and challenges of running refrigerated freight, and how to find consistent, well-paying reefer loads instead of chasing spot boards every week.
Key Takeaways
- Mounted refrigeration units, insulation, and airflow channels keep reefer cargo within a fraction of a degree of target temperature
- Spot rates show reefer freight paying roughly 14% more than dry van, per recent DAT data
- 53-foot trailers dominate long-haul refrigerated freight, while shorter units handle local and multi-stop routes
- Separate fuel costs and FSMA documentation add real overhead that carriers need to price into their rates
- Partnering with an established broker helps carriers land repeat reefer lanes instead of relying only on load boards
What Is a Reefer Truck?
A reefer truck, or reefer trailer, is a refrigerated vehicle equipped with a transport refrigeration unit that holds cargo at a set temperature from pickup to delivery. It's the backbone of cold chain logistics: the unbroken system that keeps perishable goods safe as they move from farms, processing plants, and warehouses to store shelves and pharmacies.
The scale numbers vary depending on how you count. The International Institute of Refrigeration estimated roughly 4 million refrigerated road vehicles in operation worldwide back in 2011, a dated figure but a useful signal of how much global freight depends on temperature control. Closer to home, industry survey data from ATA/TMC shows North American manufacturers built 521,800 refrigerated trailers between 2008 and 2021, accounting for about 15.2% of all trailers produced in that span.
That's a lot of specialized equipment on the highway, and demand keeps climbing as grocery delivery, pharma logistics, and frozen food shipping grow.
Why Are They Called Reefer Trucks?
"Reefer" is trucking shorthand for "refrigerated." The term covers the trailers, the cooling units bolted to them, and the entire refrigerated freight segment.
The technology traces back to Frederick McKinley Jones, who developed the first successful mobile refrigeration system in 1938. Before that, shippers relied on ice and salt to keep cargo cold, a method that was inconsistent at best. Jones's system replaced that guesswork with mechanical cooling that held a steady temperature for the length of a haul, changing how far perishable food could realistically travel. That shift mattered most for produce and dairy, which previously had unpredictable shelf lives on long-haul routes.
What Do Reefer Trucks Haul?
Reefer trailers move freight that spoils, degrades, or loses effectiveness outside a specific temperature or humidity range. Common cargo includes:
- Food and beverage: produce, dairy, meat, and frozen goods
- Pharmaceuticals and medical supplies requiring controlled temperatures
- Certain chemicals with strict handling specifications
- Fresh flowers and plants
- Electronics sensitive to humidity or heat during transit
Some of this freight has zero tolerance for temperature swings. A few degrees off, and the entire load gets rejected at the dock.
How Do Reefer Trucks Work?
Every reefer trailer runs on a transport refrigeration unit (TRU) mounted at the nose of the trailer. Most TRUs run on a small diesel engine completely separate from the tractor's engine, though many units also support electric standby mode when plugged into shore power at a warehouse or terminal.
Here's the cooling cycle in plain terms:
- Compressor pressurizes refrigerant, raising its temperature and preparing it to release heat.
- Condenser releases that heat to the outside air.
- Evaporator pulls heat out of the cargo area, cooling the air that circulates through the trailer.
This cycle repeats continuously to hold the setpoint, whether that's near -20°F for frozen goods or a mild 50°F for fresh produce.
Insulation and Airflow Keep Temperatures Even
None of this works without a trailer body designed to hold the cold in. Reefer trailers use foam-in-place insulation in the walls, ceiling, and floor to limit heat transfer from outside.
Air chutes along the ceiling and floor channels beneath the load distribute cold air evenly from front to back. Without this system, freight near the doors runs warmer than freight near the nose, and part of a load can spoil while the rest stays fine.
Catching these hot spots before they cause spoilage is exactly why modern telematics now let drivers and dispatchers monitor cargo temperature remotely. Thermo King's smart-trailer sensors, for example, hold accuracy within ±0.9°F, giving fleets real-time visibility instead of relying only on manual checks at each stop.
Reefer Truck Types and Sizes
Reefer trailers come in a handful of standard lengths, each suited to different routes:
- 28-foot trailers: regional and multi-stop delivery routes
- 48-foot trailers: a middle-ground option for some regional carriers
- 53-foot trailers: the dominant choice for long-haul truckload freight
This matches broader industry patterns: refrigerated fleets are heavily weighted toward 53-foot trailers, with shorter units reserved mostly for local delivery work where maneuverability matters more than capacity.
Weight capacity depends on the specific equipment combination. Federal law caps gross vehicle weight at 80,000 lbs on the interstate system. Once you subtract tractor, trailer, TRU (transport refrigeration unit), and fuel weight, most carriers plan around 42,000 to 44,000 lbs of usable payload, though your exact number will vary by setup.
Multi-Temperature Reefers
Some trailers now come divided into two or three separate compartments, each with its own setpoint. This lets a carrier haul frozen goods, chilled dairy, and dry freight on a single trip, cutting down on empty miles between stops. For example, one compartment might hold frozen chicken at 0°F while another carries fresh produce at 34°F and a third keeps snacks at ambient temperature, letting a single load serve three different customers instead of running three separate trips.
What Is the Difference Between a Box Truck and a Reefer Truck?
A box truck, also called a straight truck, combines the cab and cargo box into one unit. It's built for regional and local hauls where a driver makes several stops in a day.
A reefer trailer is a separate semi-trailer pulled by a tractor, designed for high-volume, long-haul refrigerated freight. Both formats can be refrigerated, but they serve different purposes:
| Feature | Box Truck | Reefer Trailer |
|---|---|---|
| Unit type | Cab and cargo combined | Separate semi-trailer |
| Typical range | Local/regional | Long-haul |
| Maneuverability | High | Lower |
| Cargo capacity | Smaller | Larger (up to 53 ft) |
Benefits of Reefer Trucking for Carriers
Reefer freight pays more. The specialized equipment, extra maintenance, and handling expertise required keep less-committed carriers out of the market, and that scarcity shows up in the rate sheet.
Do Reefer Loads Pay More?
Yes. According to DAT's June 2026 national spot linehaul data, reefer freight averaged $2.70 per mile compared to $2.37 per mile for dry van, a premium of roughly 14%, excluding fuel surcharges.
That gap isn't fixed. It widens during peak produce season and around holidays. Seasonal demand spikes, like the Pacific Northwest Christmas tree season, have pushed spot rates up by as much as 20% in the weeks before Thanksgiving in past years. Watch harvest calendars and holiday windows if you want to time lanes for better pay.
Beyond the rate premium, reefer trucking offers structural advantages:
- Year-round demand: groceries, pharmaceuticals, and medical supplies need climate control regardless of season, smoothing out cash flow
- Built-in versatility: a reefer trailer can haul dry freight when refrigerated loads aren't available, cutting deadhead risk
- Less competition: fewer carriers invest in the equipment and training reefer freight demands, often meaning steadier work for those who do
Common Challenges of Operating a Reefer Truck
Reefer trucking isn't a free lunch. The equipment and compliance burdens are real, and they eat into that rate premium if you're not prepared.
- Higher upfront and maintenance costs: refrigeration units and added insulation raise the purchase price, and only certified technicians can service them
- Separate fuel expense: the TRU runs on its own diesel supply, burning about 0.8 gallons per hour and adding thousands of dollars a year beyond your truck's fuel costs
- Stricter regulatory requirements: food and pharma freight falls under the FDA's Sanitary Transportation Rule, which requires written temperature specs and proof of compliance retained for 12 months
Factor these costs into your rate negotiations, not just the premium advertised on a load board.
How Truckers Can Find and Maximize Reefer Freight Opportunities
Getting paid well for reefer freight starts with protecting the load itself. A rejected shipment costs you the rate and your reputation with the shipper.
Protect the Load Before You Ever Leave the Dock
- Pre-cool the trailer before loading, not after. Freight loaded into a warm box rarely recovers to setpoint during transit
- Load pallets with airflow in mind. Leave gaps for cold air to circulate; solid walls of freight against the doors or ceiling create hot spots
- Stay on top of TRU maintenance. A malfunctioning unit mid-route means a rejected load, an upset shipper, and possibly an insurance claim
Build Relationships Instead of Chasing Spot Boards
Spot load boards work in a pinch, but they're a volatile way to run a reefer operation. Rates swing with the season, and every carrier on the board is chasing the same freight.
Carriers who build direct relationships with shippers and brokers land more consistent, better-matched freight. That's where a broker with real reach across industries makes a difference.
Sims Global Solutions, for instance, connects reefer carriers with shippers across food and retail supply chains through its SimsTrak transportation management system and network of vetted carriers. Instead of bouncing between load boards, carriers get matched to freight that fits their equipment and lanes.
The goal is repeat business: the same lanes, the same shippers, predictable miles. That's what turns reefer trucking from a gamble into a stable operation.
Frequently Asked Questions
What is a reefer truck?
A reefer truck is a refrigerated truck or trailer equipped with a cooling unit that maintains a set temperature for perishable freight. It's used to haul food, pharmaceuticals, chemicals, and other temperature-sensitive cargo.
Why are they called reefer trucks?
"Reefer" is trucking shorthand for "refrigerated." The technology traces back to Frederick McKinley Jones, whose 1938 mobile refrigeration system replaced unreliable ice-and-salt cooling methods.
Do reefer loads pay more?
Yes. Reefer freight typically pays a premium over dry van rates due to the specialized equipment, tighter capacity, and hands-on handling it requires.
What is the difference between a box truck and a reefer truck?
A box truck combines the cab and cargo area in one unit for local or regional hauls. A reefer trailer is a separate semi-trailer built for higher-volume, long-haul refrigerated freight.
How cold do reefer trucks get?
Reefer units can cool cargo down to around -20°F for frozen freight or hold warmer setpoints near 70°F for sensitive dry goods, depending on trailer configuration and cargo needs.
What is reefer fuel?
Reefer fuel is the diesel that powers the trailer's refrigeration unit, drawn from its own dedicated tank rather than the tractor's main fuel supply. It runs independently of the truck's engine.
