Your trailer is simply a Make: Airstream Model: Overlander, The plate also identifies that your trailer has the trim level: International Landyacht, that identifies that it has specific exterior and interior trims and wood/color/fabrics packages that were not on the basic trailer package. Airstream DID give new customers Owners Manuals in both '66 and '67 models years as I have one for my '67 Safari and have seen the '66 model year one too! The prior year owners had a package that had owners manual, and warranty/operators manuals for appliances and optional equipment. You should go to Airstream.com and click on the link for manuals for your model and year to see what is available for download or purchase from Airstream. Hope this helps! Ed
P.S. The embossed number set on the plate to the right of your main cabin door Should start with the letter "I" that indicates your International Trim package status. The other letters and numbers in that V.I.N. sequence spell out what is your original build package. An S or J indicate what factory your trailer was built in. There is a conversion table on VintageAirstream.com that will help you to completely understand those numbers.
1967 Safari Twin "Landshark" w/International trim package
1999 GMC Sierra 1500 SLT
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