Quick answer: A Canadian grain and fertilizer carrier runs on three things a general freight TMS rarely watches: the Super B, whose legal weight depends on the province, the road and the season; the paperwork trail of scale tickets that sets what the load earns; and the cargo history of each trailer, because the hopper that hauled fertilizer in May may haul canola for a crusher in September. Fertilizer such as ammonium nitrate or anhydrous ammonia adds dangerous goods rules, and for-hire Super B drivers follow the federal hours of service rules like any other carrier.
This guide is written for owners and dispatchers of Prairie and Ontario bulk carriers that haul grain from farms and elevators, and fertilizer from dealers and terminals to farms. It covers the equipment, the weight and road rules, hours of service, fertilizer as a dangerous good, cleanouts, and the scale ticket trail, then what a TMS should do for this kind of work.
What a Super B is and why it rules Prairie grain
A B-train is a double where the lead trailer carries a fifth wheel on an extension at its rear, and the second trailer couples to that fifth wheel. There is no separate converter dolly between the trailers, which makes the unit stable and easy to back. The eight-axle Super B, typically a tridem lead trailer and a tandem rear trailer behind a tandem-drive tractor, is the configuration Canadian provinces reward most for bulk work.
For grain, Super Bs are usually built as two hopper-bottom trailers. They unload by gravity through gates in the floor, one trailer at a time, which suits country elevators and inland terminals. Fertilizer dealers use the same hoppers for dry product such as potash, urea and blends, and tankers for liquid fertilizer and anhydrous ammonia.
Many carriers also run tridem hopper semis for farm yards and roads where a Super B cannot turn or is not allowed. Dispatch has to know which unit a load needs before it is assigned, not when the driver reaches the yard.
Weights, roads and spring restrictions
Canadian weight limits are set by each province. A national memorandum of understanding on vehicle weights and dimensions sets common baseline limits for the main configurations, and provinces build their own rules on top of it. Two examples on our site show the scale:
| Province | Super B or B-train double limit | Where to read more |
|---|---|---|
| Alberta | Up to 63,500 kg gross for an eight or nine-axle Super B | Alberta trucking regulations |
| Ontario | Up to 63,500 kg gross for a designated B-train double under O. Reg. 413/05 | Ontario trucking regulations |
Saskatchewan and Manitoba set their own weights by road class, and long combination vehicles such as turnpike doubles need special permits in every Prairie province. Our Saskatchewan LCV permit guide and Alberta LCV permit guide explain where the permit system starts.
Three things trip grain carriers most often:
- Spring road restrictions. Each spring, as frost leaves the ground, provinces and many rural municipalities lower allowable axle weights on secondary highways and local roads. A Super B that is legal on the main highway may be overweight on the last few kilometres to the farm. Check the province's current restriction list before every spring load.
- Axle weights, not just the gross. A load can be under the gross limit and still overweight on the tridem if the grain is not spread evenly between the trailers. Our slide and axle weight calculator and the fifth wheel and axle weight guide show how weight moves between axle groups.
- Crossing into the United States. On the US Interstate, the federal limit is 80,000 lb gross, about 36,287 kg, whatever the configuration. A Super B going south has to run far lighter than at home unless a state allows more on its own roads. Our US site explains the US weight rules and the agricultural hours exception for grain haulers.
Hours of service for grain and fertilizer drivers
The federal Commercial Vehicle Drivers Hours of Service Regulations (SOR/2005-313) cover extra-provincial carriers. Section 2(1)(a) excludes only a two or three-axle commercial vehicle used to transport the primary products of a farm, forest, sea or lake when the driver or the motor carrier is the producer of the products, plus the return trip when the vehicle is empty or carrying products used in the principal operation of the farm. A farmer hauling their own grain in a tandem grain truck may fall under that exclusion. A for-hire carrier running a Super B does not.
So harvest and seeding season change nothing about the daily limits for most carriers: 13 hours of driving and 14 hours on duty in a day, no driving after 16 hours have passed since the last 8-hour break, and the 70-hour or 120-hour cycle. Our Canadian hours of service guide walks through each rule. For drivers who never leave the province, the province sets the rules, and some provinces have their own farm exclusions, so check yours.
The pressure in harvest is real: elevators run long hours, farmers want trucks while the weather holds, and lineups at the elevator eat into the driver's day. Plan the waits into the day, because time in the elevator lineup is on-duty time.
Fertilizer as a dangerous good
Not every fertilizer is a dangerous good, but some of the most common ones are. Ammonium nitrate fertilizer is an oxidizer, and anhydrous ammonia is a toxic and corrosive gas, and both are regulated under the Transportation of Dangerous Goods Regulations. When the load is regulated:
- The consignor gives the carrier a shipping document with the UN number, shipping name, class and quantity, and the driver keeps it within reach.
- The vehicle displays the required safety marks, the placards and UN numbers for the load.
- The driver holds a TDG training certificate for the dangerous goods they handle or transport, issued by the employer.
- Dangerous goods are kept apart from incompatible loads, and from food and feed where the rules call for it.
A carrier that delivers mixed farm supplies (seed, crop protection products, feed) has to be most careful, because that is where a regulated product can end up on the same truck as feed. Ask the dealer for the shipping document before loading, not at the farm gate.
Cleanouts: what did this hopper carry last?
Elevators, crushers and feed mills increasingly ask a simple question at the scale: what did this trailer haul last, and was it cleaned? A load of milling wheat or canola can be refused if the hopper last carried fertilizer, salt or a treated seed and nobody can show it was cleaned out. A rejected load means a second trip, a disposal problem and an unhappy farmer.
The habit that prevents it is easy to state and hard to keep in harvest: record each trailer's last cargo and its cleanout (where, when, by whom) and keep the wash receipt with the load. Carriers that switch the same hoppers between fertilizer in spring and grain in late summer should make the cleanout a dispatch step, not something the driver remembers on the way to the elevator.
Scale tickets and the money trail
Most grain hauling is paid on weight, often per tonne, from the elevator or processor's scale. A typical load produces a weigh ticket where it loads, sometimes a sample or grade ticket, a weigh ticket at delivery, and a bill of lading or delivery receipt. Fertilizer loads carry the dealer's delivery ticket and, for regulated product, the shipping document.
If those tickets ride around in the cab until Friday, every invoice goes out a week late, and driver pay calculated as a percentage of the load waits with it. The fix is to get a photo of every ticket into the load the day it is issued, and to invoice on the receiving scale's weight unless the contract says otherwise. When the loading and receiving weights disagree, you will want both tickets, attached to the same load, to settle it.
How TruckerPro supports grain and fertilizer carriers
TruckerPro is a TMS for Canadian and US carriers, based in Winnipeg, Manitoba. For bulk ag work, loads carry a Hopper equipment type next to Tanker, Walking Floor and the other trailer types, and a rate confirmation that says "grain" or "bulk hopper" is read as Hopper. A dispatch leg can carry a second trailer for a Super B or other double, and TruckerPro refuses to book either trailer on two overlapping trips. From the Mobile plan, the LCV workspace couples a tractor and its trailers into a recorded B-train double combination with its driver, total length and gross weight, and keeps LCV permits, approved routes and driver certificates for loads that need them. On the Elite plan, a cross-border trip's second trailer is declared on its ACE or ACI eManifest through BorderPro.
Drivers on the TruckerPro driver app (Mobile plan and up) photograph scale tickets, BOLs and PODs into the load, typed as Scale Ticket so the office can find them the same day. Each load can list its dangerous goods with class and UN number; TruckerPro flags class pairs that segregation rules keep apart and likely feed or food commodities loaded with toxic-class goods for review, and lists every dangerous goods load on one board. The hours of service audit reads Samsara, Motive or Geotab logs against the Canadian rules in SOR/2005-313 or the US rules, and IFTA reports come from ELD distance and fuel purchases from the Operate plan.
What it does not do: TruckerPro rates loads as a flat amount or per mile, not per tonne or per bushel, so enter the agreed total once the weight is known. It does not track trailer cleanouts or previous cargo, calculate axle weights or check spring road restrictions, and its dangerous goods screening is a prompt to check the shipping document, not a TDG compliance decision.
Frequently asked questions
What is a Super B train?
A Super B is a B-train double: a tractor pulling two trailers, where the second trailer hooks to a fifth wheel mounted on the back of the lead trailer instead of a separate dolly. The eight-axle version is the standard bulk grain and fertilizer unit on the Prairies because provincial weight rules let it carry far more than a single semi-trailer.
How much can a Super B weigh in Canada?
It depends on the province and the road. Alberta allows a Super B up to 63,500 kg gross, and Ontario allows a designated B-train double up to 63,500 kg. Other provinces set their own limits, and spring road restrictions lower the allowed weight on many secondary roads, so check the province and the road before loading.
Are grain haulers exempt from hours of service in Canada?
Usually not. The federal Commercial Vehicle Drivers Hours of Service Regulations exempt only a two or three-axle vehicle carrying the primary products of a farm when the driver or the carrier is the producer, plus the empty or farm-supply return trip. A for-hire Super B is covered, and provinces set the rules for trucks that never leave the province.
Is fertilizer a dangerous good in Canada?
Some fertilizers are. Ammonium nitrate fertilizer and anhydrous ammonia are dangerous goods under the Transportation of Dangerous Goods Regulations, while many dry blends are not. When a load is regulated, the shipping document names it, the vehicle needs the right safety marks and the driver needs a TDG training certificate.
Can TruckerPro rate grain loads per tonne?
No. TruckerPro rates loads as a flat amount or per mile. Enter the agreed total once the elevator weight is known, and attach the scale ticket the driver uploads from the app to the load.
Sources
- Commercial Vehicle Drivers Hours of Service Regulations, SOR/2005-313, section 2 (Justice Laws)
- Transportation of Dangerous Goods Regulations, SOR/2001-286 (Justice Laws)
- O. Reg. 413/05, Vehicle Weights and Dimensions for Safe, Productive and Infrastructure-Friendly Vehicles (Ontario e-Laws)
- 23 CFR 658.17, Weight (eCFR)
- Council of Ministers Responsible for Transportation and Highway Safety (vehicle weights and dimensions)