Provide proof.
It's that simple.
Furthermore, Harvey, what ****ing questions have I asked, aside from PROVIDE PROOF?<!-- google_ad_section_end --> <!-- / message -->
Well, I've checked into this for TN where I live. It's legal to pull doubles up to 65' total length. As Harvey stated, nobody seems to care what ratings who put on what, other than tire ratings. If you have working lights, brakes, your tires are rated for the load, and you have the tow vehicle tagged for the weight you are pulling, everyone is happy! In TN, it is expensive to tag for heavy weight though, even for "J" tags which are farm/personal use. My 16,000 lb tags are roughly $110 per year. To go to 26,000 lb tags, it would cost me $3xx per year.
Vehicles must have at least
1 horsepower per 150 kg of total GVW.
Wow! Our trucks have the power then... for a measely 300 hp at the rear wheels, we can tow 100,000 lbs!!!! That is if we are tagged for it and our tires are rated for that!!!

--Eric