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Required lights for trailers less than 80 in. wide and less than 30 ft long.
Required lights for trailers greater than or equal to 80 in. wide and less than 30 ft long with a GVWR less than or equal to 10,000 lb.
Required lights for trailers greater than or equal to 80 in. wide and greater than or equal to 30 ft long with a GVWR greater than 10,000 lb.
All trailers greater than or equal to 30 ft long (regardless of width or GVWR).
From Title 49 - Code of Federal Regulations-Section 571.108
