Ever wondered how high you can safely load a step deck trailer? Whether you’re a seasoned hauler or new to flatbed trucking, knowing the maximum height for a step deck is critical. It can mean the difference between a smooth haul and costly delays or fines.
In this article, we’ll break down the max height for step decks, why it matters, and offer practical tips to help you navigate regulations with confidence. Let’s get started!
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Understanding Maximum Height on a Step Deck Trailer
When it comes to transporting oversized freight, the step deck trailer is one of the most popular and versatile options in the world of trucking and logistics. One of the key questions drivers, shippers, and logistics coordinators often ask is: “What is the maximum height you can load on a step deck trailer?” Let’s break down the answer clearly and cover all the must-know details.
What Is a Step Deck Trailer?
A step deck trailer, also known as a drop deck trailer, is a type of flatbed trailer with two deck levels—a higher front section (the “upper deck” or “gooseneck”) and a lower rear section (the “main deck”). This unique design allows the step deck to haul taller freight than a standard flatbed trailer, offering greater flexibility for shippers dealing with oversized loads.
What Is the Maximum Height for a Step Deck Trailer?
The maximum legal load height you can transport on a step deck trailer in the United States is typically 10 feet (120 inches) on the lower (main) deck. On the upper deck (closer to the tractor), the maximum height is usually reduced to about 8 feet 6 inches (102 inches).
These limits are based on the legal road clearance of 13 feet 6 inches (162 inches) in most states, since you must also account for the trailer’s deck height itself.
Typical Step Deck Measurements
- Overall maximum legal height (from road): 13 feet 6 inches (varies by region)
- Main (lower) deck height: 36–42 inches from the ground
- Upper deck height: 48–60 inches from the ground
- Maximum load height (main deck): 10 feet (120 inches)
- Maximum load height (upper deck): 8 feet 6 inches (102 inches)
Key Aspects and Considerations
1. Why Step Deck Trailers Are Preferred for Tall Loads
Step deck trailers are designed for the safe and legal transport of taller cargo. Here’s why they are often chosen:
- Increased load height capacity: The lower main deck height maximizes cargo height.
- Avoiding permits: Keeping loads within legal height limits means fewer special permits or escorts are required.
- Versatile loading: Easily accommodates machinery, vehicles, building materials, and large containers.
2. Dimensions, Deck Structure, and Loading
Breaking down the setup:
- Main Deck: The main, lower deck allows for the tallest freight. Most freight is loaded here.
- Upper Deck: Typically above the trailer axles, has a higher deck height and thus, less available cargo height.
- Ramps and Rear Access: Many step decks are equipped with ramps, making it possible to load drivable vehicles or machinery.
Step Deck vs. Flatbed Trailer
- A flatbed trailer generally sits 55 inches off the ground. That means a maximum freight height of around 8 feet 7 inches.
- A step deck trailer main deck often sits at approximately 40 inches high, providing up to 10 feet of freight height—allowing you to legally haul taller cargo without hassle.
Benefits of Using a Step Deck Trailer for Tall Loads
- No Overheight Permits Needed (When Under 13’6″): Save time and money by avoiding permit processing.
- Greater Safety: Proper load height reduces the risk of clearance issues with bridges, power lines, and overpasses.
- Flexible Shipping: Suits a range of load types, including construction equipment, industrial machinery, steel, and prefabricated materials.
Potential Challenges With Step Deck Trailer Height
While step deck trailers offer extra clearance, there are still important things to be aware of:
- Regional Variation: Some states and municipalities have slightly different legal height restrictions—always verify your route.
- Route Planning: Bridges, tunnels, and overpasses can sometimes be lower than standard—pre-plan to avoid low-clearance hazards.
- Securing Overheight Loads: Loads sitting at the maximum must be well-secured due to wind resistance and stability concerns.
Practical Tips and Best Practices
If you want to make the most of a step deck trailer and avoid issues:
1. Measure Your Load Carefully
- Always measure your freight’s height from the ground up, accounting for any added height from pallets or dunnage.
- Double-check that your load will not exceed 13 feet 6 inches once placed on the trailer, especially after tarping or adding chains.
2. Know Your Deck Heights
- Confirm the exact deck height of your specific trailer (main deck and upper deck), as slight variations exist between manufacturers and years.
- Use the lower deck for your tallest items to maximize legal height.
3. Plan Your Route
- Use truck routing software that flags low-clearance obstacles.
- If your load is close to the maximum legal height, consider alternative routes with higher clearances.
4. Communicate With Carriers and Shippers
- Share load dimensions upfront to select the right trailer type.
- If a permit is needed (for loads taller than legal limits), arrange it well in advance.
5. Secure Your Cargo Properly
- Use high-quality straps, chains, and tarps to prevent load shift and damage.
- Conduct safety checks before and during transit.
Cost Tips: Shipping Tall Loads on Step Deck Trailers
Shipping costs can vary depending on height and route:
- Stay Within Legal Height: Keeping your load under 13 feet 6 inches saves you money; overheight permits add cost and require more paperwork.
- Plan Ahead: Avoid last-minute permit applications and unexpected re-routing charges by measuring and planning.
- Consolidate Loads: If possible, combine shipments to maximize your trailer space, reducing costs per unit.
- Work With Experienced Carriers: Choose shippers familiar with step deck logistics—they can help you avoid costly mistakes.
Conclusion
Step deck trailers are essential for moving tall, oversized cargo efficiently and legally. To maximize load height, use the lower (main) deck, and always ensure the combined height of trailer plus load does not exceed the legal limit—typically 13 feet 6 inches in the U.S. By following measurement, planning, and securement best practices, you can move tall freight safely, avoid costly permits, and keep your shipment on the right track.
Frequently Asked Questions (FAQs)
What is the maximum legal height I can load on a step deck trailer?
The maximum legal load height is usually 10 feet (120 inches) on the main (lower) deck. This ensures the total height, including the trailer deck, does not exceed the 13 feet 6 inches legal road limit in most states.
Does my load require a special permit if it exceeds the step deck’s maximum height?
Yes. If your load (plus trailer) is taller than the legal limit (typically 13’6″), you’ll need to obtain overheight permits for every state along your route. Additional requirements like pilot cars might also apply.
What’s the difference in height capacity between a flatbed and a step deck trailer?
Flatbed trailers usually have a deck height around 55 inches, limiting the freight height to about 8 feet 7 inches. A step deck’s main deck is lower, enabling cargo heights up to 10 feet without exceeding legal overall height limits.
Are there restrictions on what can be loaded on each deck of a step deck trailer?
Tallest items should be placed on the lower (main) deck for maximum height allowance. The upper deck has less height clearance and is better for smaller or standard-sized cargo.
How can I ensure my tall load is safely and legally secured for transit?
Use appropriate tie-downs, check DOT cargo securement guidelines, and always double-check your measurements from ground to highest point after loading. Working with experienced carriers can minimize risks and ensure legal compliance.
By understanding and applying these guidelines, you’ll make the most of step deck trailers for tall and oversized freight—ensuring efficiency, legality, and safety every mile of your journey.
