Welcome to the forum. Another Northwesterner! I cant comment on your specific questions, but give it a couple days and you will get your answers from others here.
If the prices of older Airstreams and vintage Airstreams and Argosys are any guidance, they hold their value very well.
2009 F-350 FX4 Crewcab 4x4 6.4l
former '78 Argosy 20' Minuet owner
former '77 23' Safari owner
former 25' Fun Finder X-250BHS SOB owner
current 26' Komfort Trailblazer 262BSLE SOB owner