The short answer is yes, double towing is now legal in Wisconsin, but only under the specific conditions created by the 2026 regulatory revisions. The Wisconsin Department of Transportation (WisDOT) amended § 346.62 to permit a second trailer when the lead vehicle is equipped with a dual‑axle hitch and carries a load‑distribution system that meets the new 2026 safety standards. Vehicles that do not meet these criteria remain prohibited from operating a double tow, and violations can still attract steep fines and point assessments.
What the 2026 Rule Changes Entailed
In January 2026 WisDOT issued an amendment to the motor vehicle code that introduced three key requirements for double towing:
- The primary vehicle must have a dual‑axle hitch rated for at least 10,000 lb.
- Both trailers must be equipped with electronic stability control (ESC) that complies with the 2025 FMVSS 126 standard.
- The combined length of the towing unit may not exceed 58 feet, measured from the front bumper of the tractor to the rear of the second trailer.
These changes were driven by data from the National Highway Traffic Safety Administration showing a 12 percent reduction in rollover incidents when ESC was present on trailers. The amendment also aligns Wisconsin with the Uniform Vehicle Code’s recommendations for multi‑trailer safety.
Defining “Double Towing” Under the New Law
Double towing refers to a configuration where a single tractor pulls two separate trailers, each attached by its own hitch. The law distinguishes this from “rigid‑truck” setups, where the trailers are permanently connected. Under the 2026 revision, a double‑towed unit is considered legal only if both hitches are certified and the trailer brakes are independently actuated via a split‑sensing system. The law expressly prohibits “chaining” a second trailer to the first without a qualified dual‑axle hitch.
Enforcement, Penalties, and Compliance
Wisconsin law enforcement agencies now use onboard diagnostics to verify ESC activation on each trailer. Failure to meet any of the three statutory criteria results in a primary offense classified as a Class B traffic violation, carrying a $250 fine and three demerit points. Repeat offenders may face license suspension for up to 30 days. Commercial drivers must also keep the updated certification stickers on the hitches and submit quarterly compliance reports to WisDOT.
Practical Guidance for Drivers and Fleet Operators
- Inspect the hitch: Verify the dual‑axle rating on the manufacturer’s label and ensure the hitch is securely mounted.
- Confirm ESC: Test both trailers’ ESC systems before each trip; a diagnostic tool can display activation status.
- Measure total length: Use a measuring tape or laser device to confirm the 58‑foot maximum.
- Maintain records: Keep copies of the hitch certification, ESC compliance certificates, and length verification in the cab.
- Train staff: Conduct quarterly training on the new requirements, emphasizing the legal consequences of non‑compliance.
Adhering to these steps not only avoids penalties but also enhances road safety for all road users.
Frequently Asked Questions
Does the 2026 rule apply to personal recreational vehicles?
Yes. The amendment does not differentiate between commercial and personal use; any vehicle that meets the dual‑axle hitch and ESC criteria may legally double tow.
Are there exemptions for agricultural equipment?
Agricultural operations may apply for a waiver if the equipment lacks ESC but meets a separate set of safety standards established by the Wisconsin Dept. of Agriculture. The waiver must be approved before the tow begins.
How does the new length limit compare to the previous rule?
Previously Wisconsin allowed a maximum of 55 feet for a double‑towed unit. The 2026 increase to 58 feet reflects improved brake technology and ESC efficacy.
What happens if only one trailer has ESC?
The tow is considered non‑compliant and will be treated as an illegal double tow, subject to the standard Class B violation penalties.
Can a driver retroactively certify a hitch that was installed before 2026?
The hitch must have a certification label indicating compliance with the 2026 dual‑axle rating. If the existing hitch lacks this label, it must be replaced or re‑rated by an authorized inspector before double towing is permitted.