Originally Posted by
dedhed
Vehicle and hitch manufacturers make a hitch according to standard hitch classifications (SAE J684) (VESC-5) which include a tongue weight rating.
My Subaru OEM hitch (1 1/4") came with specific tow weight (2200 lb) and tongue weight (200 lb) limitations. I'm assuming that these were governed by the receiver size, which itself was governed by the car power (165 bhp). Quite reasonably, there wasn't a 2" receiver option for this car