If the 1000 pounds were that important, why would the dealers set up rigs on their lot where the tongue weight is over 1000 pounds?
Our 2013 25FB International Serenity had a literature tongue weight of 833 pounds. With full propane, water, awnings street side and rear a 155 watt solar panel and the Hensley hitch and the Shureline scale reported 1,150 pounds before I even left the lot.
That is another item in the manuals that is a remnant of the narrow body days with lower tongue weights.
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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