op wrote:
I know that this has been discussed in length about towing over weight. And it's not towing and moving the trailer but the main issue is stopping.
JFI..... brakes on the tow vehicle are the function of the FAWR/RAWR just as brakes on the tri axle trailer with 7k axles = 21000 lb of braking performance. Now add 6k FAWR and 6100 RAWR braking from a F250 = 12100 lbs of braking performance for a gross combined 33100 lbs of braking performance for this combo.
This is a email paste and copy (not mine) from another rv.net member that has been around since '09 and is from a CA size and weights LEO Commander; (snipped for length)
* You were requesting information pertaining to state laws limiting the gross vehicle weight
rating (GVWR) and/or gross combined weight rating (GCWR) for fifth wheel
and recreational vehicle owners. I have answered each of your questions
in the order asked.
Q: “Many of the owners travel over their tow vehicle GVWR and /or
GCWR. Are there any state laws against this? Or does the owner just
take the risk if they wish?”
A: The California Vehicle Code (CVC) does not contain a law that
specifically limits the amount of weight a vehicle may tow based on the
towing vehicle GVWR or GCWR. There are, however, laws that limit the
amount a vehicle may tow based on other criteria.
Section 1085(d) of Title 13 California Code of Regulations prohibits
the loading of tires above the maximum load rating marked on the tire,
or if unmarked the maximum load rating as specified in the applicable
Federal Motor Vehicle Safety Standard, or in a publication furnished to
the public by the tire manufacturer. This would most likely happen in
the case of a pickup truck towing a large fifth wheel travel trailer, as
those types of trailers tend to transfer a larger portion of their
weight to the last axle of the towing unit causing that axle to exceed
the tire load limits.
I trust this has adequately answered your questions. Should you desire
any further information, please contact Officer Ron Leimer, of my staff,
at (916) 445-1865.
Sincerely,
S. B. DOWLING, Captain
Commander
Commercial Vehicle Section" *
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As kofire says the trucks axle/tire load rating will be the legal load limit and in particular the trucks RAWR as its carrying most if not all of a trailer hitch load.