[travelin texans]

The only place anyone will find the max tow rating for any truck will be from the manufacturers advertising typically an attempt to one up the competition. That number is not listed on any of the tags posted on the trucks with the other max weight limits & does nothing but muddy up the waters for newbies & their RVs.
I know some of the newer trucks have "gooseneck & conventional trailers" weights listed on the door tags, but what they do not list is 5th wheels & travel trailers which are different from those listed. Goosenecks & conventional trailers the loads can be adjusted over the axles which lightens the pin/tongue weights therefore allowing heavier loads to be towed, which is exactly how truck manufacturers come up with that max tow rating they "advertise". It's not the same in the rv world where there is little to nothing you're able to do to adjust the load over the axles, it is what it is. Typically the truck will exceed the "posted" payload before it will ever be able to carry the load of the "advertised" max trailer weight where rvs are concerned.
RV dealers have now taken that "advertised" max truck tow weight & the dry weight posted on every rv, another useless number & used both to their advantage to sell folks a rv that most don't have enough truck for.