Definition??The term passenger car trailer is intended to refer to all types of nonpassenger trailers@ including utility trailers@ boat trailers@ and camping trailers@ which are by the conventional passenger car or light duty commercial vehicle. The following recommendations apply only to passenger car trailers that are drawn by passenger cars or light duty commercial vehicles@ and on which the coupling or couplings are located at the rear of the body of the towing vehicle. The SAE Standard is intended primary for ball-and-socket@ ring-and-pintle@ and clevis-and-pin types of couplings. It should not be construed as a limitation to these three basic types alone@ but should apply to any draft means designed to serve this purpose.
SAE J684A-1962 history
2014SAE J684-2014 Trailer Couplings, Hitches, and Safety Chains-Automotive Type
2005SAE J684-2005 Trailer Couplings@ Hitches@ and Safety Chains-Automotive Type
2004SAE J684-2004 Trailer Couplings, Hitches, and Safety Chains—Automotive Type
1998SAE J684-1998 Trailer Couplings, Hitches and Safety Chains Automotive Type