What's the deal with receiver ratings that are significantly lower than vehicle tow ratings? My newly former truck with a downsloping receiver reads 5000/12000 on a truck with a bumper rating of 9600. Receiver on the new to me truck reads 7500/12000 and the truck has a bumper rating of 12K. Is the solution to go out and find a receiver rated for 12K that doesn't require a weight distributing hitch?