Kindersley uses standard five-axle, tractor-semitrailer equipment with 48- or 53-foot vans on its U.S. operations that are governed, for the most part, by U.S. Federal axle weight limits and Bridge Formula B. If the Canamex proposal were implemented, Kindersley would be interested in operating Rocky Mountain Doubles in this operation.
B & D Walters Trucking 
B & D Walters operates seven-axle semitrailer combinations for livestock hauls and and eight-axle semitrailer combinations for grain hauls between Alberta and the northwest States. The seven- axle combinations include four-axle tractors with the second being a lift axle and three-axle semitrailers. The eight-axle combinations include the same tractor configuration and four-axle semitrailers with the fourth axle, a lift axle. When crossing the border, the tractor lift axle is lowered in Montana and raised in Alberta. The seven axles are spread sufficiently to get a permissible GVW of 99,000 pounds under Bridge Formula B as allowed in Montana and the 46,500 kilogram GVW RTAC loading in Alberta. In addition to Montana, Washington and Idaho allow the use of four-axle tractors. B & D indicates that Oregon “frowns-on” their use.
With a 90-foot outer bridge length, A-train doubles can load to a GVW of 116,000 to 118,000 pounds for Montana. This is 4,000 to 6,000 pounds more than allowed on the nine-axle B-train. To achieve this GVW, the vehicle's drawbar must be stretched from 18 to 20 feet in length. (Comment: This is an example where Bridge Formula B works to create vehicles of potentially questionable stability performance relative to readily available alternatives, rewards them with greater payload, and does so in a way to inflict greater damage to a pavement per unit payload).
B & D operates eight-axle B-trains into Montana at 108,000 pounds GVW. With a four-axle tractor, a nine-axle B-train can operate at 114,000 pounds GVW. Because of the weight incentive to use B-trains in the RTAC regulations, Canadian carriers are abandoning the use of A-trains. U.S. carriers continue to use A-trains and where possible stretch them to maximize payloads under Bridge Formula B.
B & D trucks some grain into Sweetgrass, Montana on I-15 for trans-shipping to the BN for movement in the United States. This can be done at Canadian weights under the ISTEA provisions for this road.
2.7 Truck Inventory and Use Characteristics
This section presents truck fleet information developed from the 1992 Truck Inventory and Use Survey (TIUS) for the western border States. TIUS data are allocated to individual States by place of registration. The data on the truck fleet in each State excludes pickups, panels, vans, utilities and station wagons (that is, it includes only data from Column D in the TIUS reports).