This is just an observation, and I will TRY to keep it to things I know, and hopefully everybody will be NICE when they shove these observations down my throat...
My 2000 F350 has a tow rating of 20K, but in the fine print it says that is 5th wheel rated, all other is limited to 10K, so apparently I can tow 10k from the bumper or the 2" receiver. Now since the truck manufactor limits the bumper to XX pounds, that only makes sense to use the receiver hitch which is limited to 10K. Now if I want to haul 10001 pounds using the receiver, all I have to do is upgrade to a higher rated receiver, make sure the ball and pin are rated to that amount and start hauling, RIGHT?
The problem I see with that idea is simple. The D.O.T, law enforcement, and especially the ATTORNEY'S will still see the truck as a 10K max receiver truck, with some added safety capacity, but it is still a 10K rated truck. As long as the manufacturer rated it as that, and right up to when somebody upgrades the truck (not just one piece it) and pays to have it certified, which includes all of the parts, that it is now capable of hauling more, the lawyers and law enforcement will still nail you when stuff hits the fan. They will argue that nothing changes the manufacturer's rating except either the manufacturer or some engineering firm with way too much time and money on their hands. All I am saying, is that changing the hitch to a higher rated hitch isn't going to increase what the manufacturer rated the truck at, even if the component manufacturer says their hitch is rated at XXX more than the manufacturer.
David from jax