Choosing the right trailer for hauling is more than just picking one that looks good. You need to make sure the size is right for what you’re planning to tow, so you stay safe and efficient on the road. There’s a huge variety of trailers out there, from small utility trailers to massive semi-trailers, each with its own set of dimensions.
So, how long is a trailer, really? This guide breaks down the common sizes for different types of trailers. We’ll look at key measurements like width, length, and height, and give you the information you need to pick the perfect trailer for your needs. And of course, we’ll touch on federal and state regulations that might affect your choices.
What is a “Standard” Trailer Size?
If you’re shopping for a trailer, you’ll quickly realize that the word “standard” is a pretty broad descriptor. Trailer sizes vary quite a bit depending on the type of trailer and what it’s designed to haul.
In order to choose the right trailer, you’ll need to consider what you plan to use it for. The weight of your cargo, the type of goods you’ll be hauling, and where you’ll need to park the trailer all play a role in determining what size best suits your needs.
Key Trailer Dimensions
Here’s a look at typical trailer dimensions:
- Width: Most trailers are between 6 and 8.5 feet wide. Be sure to measure the interior width of any trailer you’re considering.
- Length: Trailer lengths can vary from as little as 8 feet to more than 53 feet. Different trailer types tend to have different typical lengths.
- Height: A common height for trailers is around 7 feet. Keep in mind that some locations may have height restrictions.
Common Trailer Dimensions by Type
Trailers come in a wide range of sizes, depending on their intended use. Here’s a look at some common trailer types and their typical dimensions:
Utility Trailers: The All-Purpose Hauler
Utility trailers are your go-to option for general hauling needs, from yard waste to furniture. They typically range in length from 8 to 22 feet, making them versatile for a variety of tasks.
Enclosed Trailers: Keep Your Cargo Protected
Enclosed trailers offer protection from the elements and added security for your cargo. These trailers typically range from 8 to 32 feet long.
Flatbed Trailers: Space Without Walls
Flatbed trailers are ideal for hauling oversized or irregularly shaped items that wouldn’t fit within the confines of an enclosed trailer. These trailers are all about open space and ease of loading. Flatbeds typically range from 20 to 48 feet in length.
Flatbed trailers come with maximum weight and size restrictions. The maximum weight is usually around 48,000 pounds (or 65,000 pounds for a tri-axle trailer). The maximum dimensions are generally 48 to 53 feet long, 8.5 feet wide, and 8.5 feet high.
Gooseneck Trailers: Built for the Big Jobs
Gooseneck trailers are designed for heavy loads and increased stability. They connect to a hitch in the bed of a pickup truck, providing a more secure and stable connection than a bumper pull trailer. Gooseneck trailers typically range from 20 to 40 feet in length.
Car Hauler Trailers: Moving Vehicles Safely
Car hauler trailers are specifically designed for transporting vehicles. They come in a variety of configurations, from open trailers to enclosed trailers, and typically range from 14 to 24 feet long.
Equipment Trailers: Built Tough for Heavy Machinery
Equipment trailers are constructed to handle heavy equipment and machinery. These trailers are built tough and typically range from 14 to 30 feet in length.
Semi-Trailer Dimensions and Load Capacities
When you start talking about semi-trailers, you’re talking about some big equipment. Here’s a quick rundown of the sizes and maximum weights for several common types of semi-trailers:
Flatbed Trailers
- Length: 48 to 53 feet
- Width: 8.5 feet
- Height: 8.5 feet
- Maximum weight: 48,000 pounds (65,000 pounds for a tri-axle)
Dry Vans
- Length: 48 to 53 feet
- Width: 8.2 feet
- Height: 8 feet
- Weight: 42,000 to 45,000 pounds (63,000 pounds for a tri-axle)
Refrigerated Trailers
- Length: 48 to 53 feet
- Width: 8.2 feet
- Height: 8 feet
- Weight: 42,000 to 45,000 pounds (63,000 pounds for a tri-axle)
Lowboys
- Length: 24 feet to 29.6 feet
- Width: 8.5 feet
- Well Height: 18 to 24 inches
- Weight: 40,000 pounds (standard two-axle). Can handle additional cargo combination weight up to 95,000 pounds
Step Decks
- Length: 48 to 53 feet
- Width: 8.5 feet
- Height: 10 feet
- Weight: 48,000 pounds (standard), 65,000 pounds (tri-axle)
Federal and state regulations
When it comes to trailers on U.S. roads, there are federal and state regulations that govern their size and weight. These rules are in place to ensure safety and protect infrastructure.
Federal regulations for interstate highways
On interstate highways, federal regulations stipulate the following:
- Maximum gross vehicle weight: 80,000 pounds
- Single axle weight limit: 20,000 pounds
- Tandem axle weight limit: 34,000 pounds
There’s also something called the Bridge Formula, which is used to determine the allowable weight based on the number and spacing of axles. The formula is W = 500(LN/N-1 + 12N + 36), where:
- W = the overall gross weight on any group of two or more axles
- L = the distance in feet between the extreme of any group of two or more consecutive axles
- N = the number of axles being considered
The Bridge Formula is intended to prevent damage to bridges by limiting the concentration of weight over a specific area.
State regulations
It’s important to remember that state regulations can vary significantly. These regulations can cover a range of aspects, including:
- Oversize load permits
- Single axle restrictions (for example, Connecticut allows up to 22,400 lbs if axles are spaced over 6 ft apart, while Florida allows up to 22,000 lbs)
- Gross weight restrictions
- Width restrictions
- Height restrictions
Because of this variability, it’s crucial to check the specific regulations of each state you’ll be traveling through to ensure compliance and avoid potential fines or penalties.
Choosing the Right Size Trailer: Practical Considerations
As you can see, trailers come in a range of sizes to fit a range of needs. But how do you know which one is right for you? Here are a few practical points to consider before you buy:
- Figure out what you’ll be hauling. What kind of cargo will you typically be hauling? Get a handle on the weight and dimensions of your typical loads.
- Check your vehicle’s towing capacity. Before you commit to a trailer, make sure its weight rating matches what your vehicle is capable of towing. Check your owner’s manual for the specifications.
- Think about storage. Where will you keep your trailer when you’re not using it? Measure the space you have available, and make sure you’ve accounted for the trailer’s overall dimensions, including the hitch.
- Factor in trailer dimensions. Pay close attention to the interior width and length. And don’t forget to think about the trailer’s height and whether you’ll have any issues with overhead clearance.
- Plan for the future. Do you think your hauling needs will change over time? If so, it might be wise to choose a trailer that’s a little bigger than what you need right now, so it can accommodate future growth.
To Conclude
Whether you’re hauling equipment, livestock, or recreational vehicles, it’s important to think carefully about trailer dimensions and relevant regulations. Remember to consider width, length, and height as you’re shopping around.
The right trailer size depends on what you plan to haul and the towing capacity of your vehicle. If you’re hauling a boat or horses, you’ll need a specialized trailer designed to keep your precious cargo safe and secure. If you’re hauling construction equipment, you may need a flatbed or lowboy trailer.
If you’re feeling overwhelmed by the number of choices, talk with a professional trailer dealer or mechanic. They can help you determine the right trailer for your needs and make sure you’re up to date on state-specific regulations.