Trucking Education
Which Trailer Axle Pin Is Legal? The 37–41 ft Rule Explained
Are your trailer tandems legal at the first pin, 37 ft, or 41 ft? This practical guide explains the 37–41 ft rule for standard 53-ft tandem trailers, why axle-position rules differ by state and route, California’s different measurement point, and how sliding tandems affects axle weight. Educational reference only—always confirm the current rule for your specific route and configuration.
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Are your trailer tandems legal at the first pin, 37 ft, or 41 ft? This practical guide explains the 37–41 ft rule for standard 53-ft tandem trailers, why axle-position rules differ by state and route, California’s different measurement point, and how sliding tandems affects axle weight. Educational reference only—always confirm the current rule for your specific route and configuration.