How Wide Is a Boat Trailer?

How Wide Is a Boat Trailer?
If you’re in the market for a boat trailer, it’s important to know how wide it is. Knowing the width of your boat trailer can help you determine if it meets local regulations, as well as make sure it fits safely and securely on roads and highways. But what exactly is the width of a boat trailer?

Types of Boat Trailers
The width of a boat trailer depends on several factors, including the type of trailer you choose. Generally speaking, there are three types of boat trailers: single-axle, tandem-axle, and triple-axle trailers. Single-axle trailers are typically lighter and more affordable than tandem- or triple-axle trailers. However, they may not be able to accommodate larger boats or weightier loads. Tandem-axle and triple-axle trailers offer greater load capacity and stability when towing large boats.

Width Standards
The National Highway Traffic Safety Administration (NHTSA) has set standard widths for all types of trailers, including boat trailers. According to their standards, single-axle trailers must have an overall width of no more than 8 feet 6 inches (102 inches). Tandem-axle trailers must have an overall width of no more than 10 feet 6 inches (126 inches), while triple-axle trailers must have an overall width of no more than 12 feet 6 inches (150 inches). The American Boat & Yacht Council (ABYC) also sets standards for the maximum allowable widths for certain types of boats being towed by single-, tandem-, or triple- axle trailers.

Factors Affecting Trailer Widths
The type and size of the boat being towed can also affect a trailer’s overall width. For example, wider boats such as pontoon boats require wider trailers to ensure proper load distribution and stability when towing them down the road. Additionally, if you decide to use a tandem or triple axle trailer instead of a single axle one, this will also increase its overall width due to the extra axles.

Legal Considerations
It’s important to note that some states may impose additional restrictions on the maximum allowable width for certain types of vehicles or loads on public roads; so be sure to check with your local Department of Motor Vehicles before purchasing a boat trailer or hauling your vessel down the highway.

Calculating Widths
To accurately measure your boat trailer’s overall width, first measure from one side rail to another side rail across the widest part of the frame; then measure from one fender flare to another fender flare across the widest part outside surface; finally add these two measurements together to get your total overall width measurement in inches or feet depending on what unit you prefer using.

Advantages Of Knowing Widths
Knowing your exact boat trailer’s dimensions can help ensure that you don’t exceed any legal limits when driving down public roads with your vessel in tow; this can help prevent costly fines from law enforcement officers who may pull you over for violating any state laws regarding vehicle size limits on public highways. Additionally, knowing your exact trailer’s dimensions can help you determine if it will fit in tight spaces such as parking lots or driveways without having to worry about hitting any obstacles along the way.


In conclusion, knowing how wide is a boat trailer is essential for safe operation when transporting vessels down public highways or tight spaces such as driveways or parking lots. The type and size of the vessel being towed will affect its required minimum size; however most states impose maximum legal limits on vehicle sizes that must be adhered too regardless if they are larger than what is needed for proper load distribution and stability when hauling certain vessels down public roads. It is also important to accurately measure your specific boat trailer’s dimensions before taking it out onto public highways so that you know exactly how wide it is at all times during transport operations.