The math does work out pretty well for a 27FB.
7,600 pounds GVW - 770 pounds literature tongue weight = 6,830 pounds
6,830 pounds divided by 4 tires = 1,707 pounds per tire.
Based on the older 15" Michelins I have on the 23D derated pressure of 1,983 pounds, the tires are loaded to 86% of capacity in the example above. That percentage improves (tire load decreases and so does the tire load percentage) with the actual tongue weight being higher.
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TV - 2012 Dodge 2500 4x4 Cummins HO, automatic, Centramatics, Kelderman level ride airbag suspension, bed shell
2014 31' Classic model 30 twin beds, 50 amp service, 900 watt solar system, Centramatics, Dill TPMS, disc brakes, 16" tires & wheels