The Final Rule you are attempting to access, "49 CFR 383 and 390 - Gross Combination Weight Rating; Definition", is reserved for subscribers.

Excerpt from "49 CFR 383 and 390 - Gross Combination Weight Rating; Definition"
The Federal Motor Carrier Safety Administration has amended the Federal Motor Carrier Safety Regulations by revising the definition of "gross combination weight rating" (or GCWR) to clarify the applicability of the Agency's safety regulations for single-unit trucks (vehicles other than truck tractors) when they are towing trailers, and the GCWR information is not included on the vehicle manufacturer's certification label.

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Internal Reference: Catcode=A221 Funcode=SZ47