Here may be the location you need.
Manuals, Airstream Travel Trailers, Touring Coaches | Airstream
Download the third file. It is to the right of the words "trailer-motorhome weights".
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WBCCI Life Member 5123, AIR 70341, 4CU, WD9EMC
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