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I have attached a file that contains the weights and measures for most Airstreams produced in the past 40+ years. Keep in mind that these weights do not include options, accessories, water, LP, nor personal possessions. The table shows your coach at approximately 3,400 pounds which means that your loaded (wet weight) will likely be somewhere between 4,500 and 5,000 pounds with the loaded hitch weight approaching 600 pounds.
Good luck with your Globetrotter!
Kevin D. Allen
WBCCI (Lifetime Member)/VAC/Free Wheelers #6359
1964 Overlander International/1999 GMC K2500 Suburban (7400 VORTEC/4.11 Differentials)
1978 Argosy Minuet 6.0 Metre/1975 Cadillac Eldorado Convertible (8.2 Liter V8/2.70 Final Drive)