mtnman -- The VIN is embossed into the streetside A-frame just below the propane tanks if I recall. On my 24' there is about a 3x4" metal label with the date of manufacture, GVWR, axle ratings and the VIN riveted near the water fill door just below the front window. This may be placed elsewhere on different models...
Another issue you may see is condition of the tambour -- plastic rolltop desk type openings for bins and overhead cabinets. This isn't a make-or-break issue and methods to repair are posted. A bit of silicone is effective in making them slide easier. You may find the window gaskets are old and dry if they've never been replaced -- ordinary stuff though is a bit of work. Ask back on particulars if you aren't finding it in the search function. They also need annual silicone treatment.
Still another issue is operability of the 4 stabilizer jacks under each corner of the trailer. Mine were rusted and frozen -- a previous owner must have parked it and let grass grow up around it -- a prime cause of frame rust. There may be a hand crank -- otherwise a standard spark plug socket fits these -- handy to operate with a battery powered drill when camping.
Hmm... What have I been saying? My Argosy is in the driveway (under 4" of new snow) and it measures approx 7'8" outside width. I don't want to open the door to measure inside with the blowing snow right now. The 22' signifies bumper to ball length. All Argosy balls are 2 5/16" -- I can just about assure you of that. juel is right -- a darned pleasurable towing trailer!!
A recent Argosy evaluation that turned out badly is at: http://www.airforums.com/forum...4-a-19123.html
Some of Kevin Allen's (overlander64) Argosy brochure scans: http://www.airforums.com/photo...eimages&c=3178
Advance thru the pictures. Fourteen images of Argosy brochures. You get a better idea on model types toward the end of his series. Click in the picture if it isn't real clear -- you should get an enlarged version.
Too bad but the best web photo collection of Argosy models by year, www.argosytrailer.com
, seems to have disappeared from its server. I noticed this earlier this fall.