Trailer light requirements: under 80 vs. over 80—what do I need?

The “80” designation in trailer lights refers to the overall width of the trailer in inches, not the type of trailer or its weight. To determine which lights you need:

Step 1: Measure Trailer Width
Measure your trailer at its widest point. This usually includes the fenders or any side steps that extend beyond the frame.

Step 2: Compare Against the 80-Inch Rule

• Under 80 inches wide → You’ll need “under 80” trailer lights.
• 80 inches wide or greater → You’ll need “over 80” trailer lights, which typically include additional side markers and identification lights for compliance with DOT regulations.

Step 3: Confirm With Local Regulations
While the 80-inch rule is a federal guideline in the U.S., it’s always smart to double-check your state or local requirements to ensure compliance.

✅ Pro Tips:

• Always measure across the widest legal point of the trailer—not just the frame.
• If your trailer is right on the line (79–81 inches), it’s usually best to go with “over 80” lights for peace of mind and legal compliance.
• Using the wrong kit may result in fines, failed inspections, or unsafe towing visibility.