Note that the 27FB Classic has a published GVW of 9,000 pounds but uses the same two 5,000 pound rated axles of the 31' Classics. The real useful load of the Classic 27FB over the FC or International 27FB models is around 800 pounds due to the over 800 pounds of Hickory installed in the Classic.
The 16" SenDel T03-66655T wheels used by Airstream are rated 3,580 pounds at 80 psi. The Michelin LT225/75R16/E LTX M/S2 tires are rated 2,680 pounds @ 80 psi. So the week link in the Classic suspension chain is the axle rated at 5,000 pounds.
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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