Weights and Dimensions for Divisible Loads

  • Big Truck Guide is your ‘one-stop-shop’ for information about Semi Truck weights and dimensions
  • We specialize in sizes of trucks carrying regular goods “Divisible Loads”

Training and Reference Materials

  • Download textbooks, ebooks and pamphlets
  • Useful for truck driving instructors, truck drivers, shippers and anyone else who has a need for clear information on size and weight regulations.

Compare across the United States and Canada

  • Compare between 27 different truck types across US States and Canadian Provinces
  • View Gross Weights, Axle Weights and Dimensions in one place


MyBigTruck Reports

Load Heavy. Stay Compliant. Make More Money

US State, US Federal and Canadian Provincial truck size and weight regulations are all different and cause compliance headaches for shippers, trucking companies and truck drivers. Now with MyBigTruck reports you can enter your axle spacings pertaining to your unique truck and generate a report that contains the following information:

  • Maximum Axle Weights
  • Maximum US Federal and other Bridge Weights
  • Maximum Gross Weights – Unpermitted
  • Maximum Gross Weights – with Permit
  • US Federal Bridge Detailed Compliance
  • Compliance with Kingpin to Rear Axles
  • Compliance with Trailer Length
  • Available for 5 and 6 Axle semi trucks

Download a Sample Report Here!

Understanding Truck Weights and Dimensions – E-textbook and training program

Purchase the textbook and gain access to quizzes for only $9.99 USD

After working through this book you will be able to:

  • Distinguish between gross weights, tare weights, and payloads
  • Identify the different types of weight limits that apply to vehicles:
    • Gross Weights
    • Axle weights
    • Tire Weights
    • Manufacturers’ Weights
  • Learn where US Federal Laws apply
  • Understand how the Federal government controls truck dimensions
  • Understand how the Federal government regulates weights including Bridge Weights
  • Learn why kingpin to rear axle restrictions are in place
  • Find out how to adjust your axles, and in what direction
  • Find out what the maximum and minimum limits are for KPRA measurements.
  • 49 Pages

Kingpin to Tandems Cheat Sheet PDF

Purchase this document for only $5 USD

Everything that you need to know about Kingpin to Tandem Axle Measures in 4 pages:

  • Printable copy of the Kingpin to Tandem Axles Maximums Table
  • Printable copy of the Kingpin to Tandem Axle map
  • Instructions on when and how to move your tandems
  • Where Kingpin to Tandem Minimum measure restrictions are in place
  • 4 Pages

Membership Options

For more information on how we use your information and how we will deliver our product, please see our privacy policy and our returns policy.

List of tools available in the membership area

Detailed Truck Information

Detailed Truck Information

This tool gives all the basic information about each specific truck type, within each jurisdiction. Summary information includes the gross weight allowable in the jurisdiction, axle spreads, and dimensions.

Gross Weight by Truck Type

This is a great tool to find out where you can operate specific combinations. Often the same truck can have different weight limits depending on the road that is being travelled. For this purpose, sub jurisdictions are listed that can operate at different weights, permitted or not.

Dimension Comparer

The Dimension Comparer is a way to drill down into a specific dimension and compare limits across jurisdictions. Height limits are different in each state and you can easily view these limits across all jurisdictions using this tool. Other common dimension to compare are the length of a straight truck, and trailer length.

State Information

A summary of the rules in each particular state or province, along with a listing of the truck types that can operate within each state or province. This is useful when you are looking for which types of trucks are available to be used for your application in each state.

This website is a go-to any time I’m wondering if a particular state is going to like the fact that the stupid sugar plant loaded me heavy on the rear. I trust this website more than I trust The Evil Overlord (wife and ex-codriver) with a carving knife in her hand. I trust that’s good enough for you.

From: Trucker Magazine, January 2016

Todd McCann


We at SandCan would like to thank you for your valuable input toward the configuration of our transportation equipment.
Considering the many options that are approved and disapproved throughout the Americas your knowledge and advice was invaluable.
We fully intend to continue utilizing to your Big Truck Guide service for the foreseeable future and truly appreciate your service.
Thank you sincerely,
John Sheesley

John Sheesley


Access all Big Truck Guide Information with a Monthly Subscription Today!

The Big Truck Guide Database

The Big Truck Guide Database is a collection of information about trucks carrying divisible loads. This means regular freight.

This database was initially assembled in 2014 by collecting and interpreting legal codes from all US States and Canadian Provinces. Since then, updates have been made to the database and continue to be made. A recent list of changes that have been made to the database can be seen below.

A brochure explaining the database can be downloaded from the link below:

What sets out information apart:
Restrictions on truck weights and measures are written in legal codes in a restrictive way. Laws say “The maximum kingpin to tandem axles distance is 41’ except for when the trailer is 48’ long or less.” 

Instead, what is more useful to everyone is that on my 5 axle truck with a 53’ trailer I must have a Kingpin to tandem axles distance of 41’. 

The difference is that in the second statement, the laws have been interpreted to apply to a particular truck. And this is how Big Truck Guide is different. In our database, you will find a list of restrictions as they apply to a particular truck type. The Big Truck Guide database contains 27 different truck types that are commonly used across the United States and Canada, and you can easily compare between these truck types. The result is that you know that your 6 axle truck can be 14 feet high in Kansas and only 13’6″ high in Kentucky.

Arizona website update

The website for the Arizona oversize and overweight office was updated to: https://www.azdot.gov/mvd/MotorCarrierServices/commercial-permits/oversize-overweight-permits

Oklahoma State Roads Permitted Loads

Big Truck Guide had incorrectly identified Oklahoma as a state where you can obtain permits up to 90,000 lbs on the interstate, depending on the configuration. In fact, there are permits for divisible loads available only for state roads up to 84,000 lbs.

Updated Washington State Gross Description

In Washington State, trucks can operate to 105,500 lbs if they are licensed for that weight. This was added to the descriptions of several trucks, where there was just the estimated gross weight based on generic wheelbases.

North Dakota Permitted Weights

North Dakota allows weights up to 105,500 lbs on state roads for truck combinations that comply with the bridge formula. These trucks are also allowed permitted on the interstate. This rule does not apply to LCV combinations.

South Dakota Interstate Permitted Weights

South Dakota has no weight limit on state roads, vehicles must just comply with the bridge formula. This can also apply to the interstate, but these trucks require a permit. This was added to the database.

Updated KPRA Map

Alabama changed to green color to reflect that trailers up to 53'6" have no KPRA Maximum Connecticut incorrectly showed 42'8" as the KPRA distance. Changed to 43'.

Change Of Illinois Routes description

Illinois has 3 classifications of roads for trucks, Class I, II and III. Specified that regulations listed only pertain to 'Class I and II'.

Canadian B-Train Lengths

Canada has moved to B-Train Lengths of 27.5 meters in the memorandum of understanding between the provinces. This year, you can expect that some provinces will allow these lengths with no restrictions while others require permits until they can pass legislation to...


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Ever wonder what the difference between A Trains and B Trains were? Did you even know about the existence of C Trains? This article explains the different ways that two trailers are hooked to one another in North America. When you refer to a set of trailers as A, B or...

US DOT studying heavier Semi truck trailers

On December 18, the United States Department of Transportation put on a webinar to present their progress in studying the raising of federal Semi truck trailer size and weights, and an opportunity for interested parties to provide feedback. The study will find out the...

Sample Information

Browse Regulations Pertaining to a Standard 5 Axle Truck