Whether you’re hauling corn, soybeans, livestock, or hay, weight limits are part of everyday life in agricultural trucking.

But did you know that hauling overweight or operating outside your permit conditions could also create insurance problems?

Understanding the rules can help you avoid expensive tickets, protect your equipment, and keep your agricultural trucking operation running smoothly.

Here’s what every agricultural hauler should know.

The Short Answer: Does Weight Affect Your Trucking Insurance?

Yes. Weight limits and permits can affect your agricultural trucking insurance.

Here’s how:

• Insurance applications: Your insurance company needs to understand what you’re hauling, where you operate, and how your trucks are used.

• Insurance claims: Being overweight or violating permit conditions can complicate a claim, depending on the circumstances and policy terms.

• Fines and penalties: Overweight tickets and regulatory fines generally aren’t covered by trucking insurance.

• Equipment damage: Excessive weight can put additional stress on tires, brakes, axles, and other equipment.

The best approach? Know your weight limits, follow your permit requirements, and keep your insurance agent informed when your operations change.

What Are the Weight Limits for Agricultural Trucks?

Federal weight limits generally apply to commercial trucks operating on Interstate highways.

According to the Federal Highway Administration (FHWA), the standard limits are:

These limits also depend on axle spacing and the federal bridge formula.

What Is the Bridge Formula?

The bridge formula determines how much weight a truck can legally carry based on its number of axles and the distance between them.

For example, a truck might weigh less than 80,000 pounds overall but still violate federal weight requirements because too much weight is concentrated on certain axles.

Important: State highways may have different limits. Some states also have special agricultural exemptions or grandfathered weight allowances.

Always verify the requirements for the roads you’re traveling.

Can Agricultural Trucks Haul Overweight During Harvest?

In many states, yes!

Some states offer special agricultural weight allowances during harvest or planting seasons.

These exemptions can make it easier for farmers and agricultural trucking companies to transport commodities such as:

• Corn and soybeans

• Wheat and other grains

• Livestock

• Hay and forage

• Other qualifying agricultural products

However, the rules vary depending on your state, the commodity you’re hauling, and your route.

South Dakota’s 2026 Agricultural Weight Exemption

On September 28, 2026, South Dakota Governor Larry Rhoden signed Executive Order 2026-11 to provide additional flexibility for agricultural haulers.

The order:

• Allows qualifying agricultural commodities to be transported at up to 10% above applicable weight restrictions.

• Temporarily suspends the $25 overweight trip permit fee.

• Expands agricultural hauling flexibility beyond certain traditional harvest trips.

But there are important restrictions.

The order does not allow trucks to exceed posted bridge weight limits or the specified 20,000-pound-per-axle maximum.

Because this is a temporary order, agricultural haulers should confirm that it remains effective and that their particular trip qualifies.

What Happens If You Exceed a Posted Bridge Limit?

South Dakota has already seen why this matters.

In a case decided by the South Dakota Supreme Court in 2018, a truck hauling soybeans weighed approximately 87,000 pounds when it crossed a bridge posted for 66,000 pounds.

The driver argued that the agricultural harvest weight exemption applied.

The court ruled that the exemption did not override the bridge’s posted weight restriction.

The result included a $150 criminal fine and $15,750 in civil penalties.

The takeaway: A harvest exemption doesn’t mean you can ignore posted bridge restrictions.

How Do Overweight Permits Work for Agricultural Hauling?

An overweight permit allows a qualifying truck or load to operate above certain normal weight restrictions, subject to specific conditions.

Depending on the state and type of load, permits may include:

• Maximum allowable weight

• Approved travel routes

• Permit expiration dates

• Axle weight and spacing requirements

• Travel restrictions or special equipment requirements

Some permits cover individual trips, while others may cover longer periods.

Do You Need a Permit to Haul Overweight Grain?

Not necessarily.

Many agricultural commodities, such as grain, are considered divisible loads because they can be separated into smaller shipments.

Standard overweight permits are often intended for loads that cannot reasonably be divided.

However, states may provide separate agricultural permits, exemptions, or seasonal weight allowances.

Before hauling overweight, contact your state Department of Transportation to verify whether your load qualifies.

How Do Weight Violations Affect Agricultural Trucking Insurance?

Weight violations don’t automatically mean your insurance policy won’t cover a claim.

However, they can create complications that agricultural trucking companies should understand.

1. Your Insurance Application Must Match Your Operation

When applying for agricultural trucking insurance, underwriters may consider:

• Types of agricultural commodities hauled

• Operating radius and states traveled

• Number and type of trucks

• Driver experience

• Seasonal operations

• Whether you’re hauling your own products or hauling for others

If you begin using additional trucks during harvest or expand into another state, your insurance company may need updated information.

Changes in your operation can affect underwriting, coverage, and premiums.

2. Overweight Accidents Can Complicate Insurance Claims

Imagine you’re hauling grain during harvest.

Your truck is overweight, and you’re involved in an accident.

The insurance company may investigate whether the weight contributed to the accident and whether your operation complied with applicable policy requirements.

Does that automatically mean your claim is denied?

No.

Coverage depends on your specific policy language, applicable law, and the circumstances of the accident.

However, the additional investigation can make the claims process more complicated.

3. Insurance Generally Doesn’t Pay Overweight Fines

If you’re ticketed for operating overweight or violating a posted bridge limit, your trucking insurance generally won’t pay the fine.

For example, you could face:

• Overweight citations

• Permit violation penalties

• Bridge weight violation fines

• Other regulatory penalties

These costs can add up quickly, especially when multiple violations occur.

4. Overloading Can Damage Your Equipment

Carrying excessive weight can place additional strain on:

• Tires

• Braking systems

• Suspension components

• Axles

• Transmissions and drivetrains

Commercial truck physical damage insurance commonly excludes ordinary wear and tear and mechanical breakdown.

A mechanical failure caused by overloading may not qualify as covered physical damage.

However, coverage for damage resulting from an accident depends on the policy and circumstances.

Does Your DOT Inspection History Affect Insurance?

Yes. Your roadside inspection and violation history can influence how insurance companies evaluate your trucking operation.

Underwriters may review safety information to identify patterns involving:

• Overweight violations

• Brake and tire violations

• Vehicle maintenance issues

• Driver violations

• Out-of-service violations

A history of violations may make it harder to qualify for certain insurance programs or competitive rates.

Keeping your trucks compliant and maintaining a strong safety record can help your operation remain attractive to insurers.

Farm Trucking vs. For-Hire Agricultural Trucking

There’s an important difference between hauling your own agricultural products and transporting agricultural commodities for someone else.

Private or farm hauling: You transport your own crops, livestock, or agricultural products as part of your farming operation.

For-hire agricultural trucking: You transport commodities belonging to others in exchange for compensation.

For-hire operations may require different insurance coverage, authority, or regulatory filings.

Farm exemptions can also depend on the ownership of the commodities, vehicle use, trip, and other factors.

If you begin hauling for neighboring farmers, grain elevators, or other customers, talk with your insurance agent before taking those loads.

Agricultural Trucking Checklist Before Harvest

Before your trucks head out this harvest season, take a few minutes to review these items.

• Check truck weights. Know your loaded gross weight and individual axle weights.
• Verify harvest exemptions. Confirm current rules and effective dates with your state.
• Review bridge restrictions. Watch for posted weight limits along your route.
• Check permit requirements. Make sure you have the right authorization when required.
• Inspect your trucks. Check tires, brakes, suspension, and other critical equipment.
• Communicate with drivers. Review routes, weight limits, and permit conditions.
• Update your insurance. Notify your agent about new vehicles, drivers, commodities, or operating areas.

A little preparation before harvest can help prevent expensive problems later.