Carol, my 2001 has the A/C in the closet. I'm going to say they continued offering them there for a good half dozen years into the 2000's, if I recall correctly.
As for the tree decal it is a decal they used way back when, however there are folks in recent years that have purchased some of those decals from the factory and put them on. So they are not a give away to the age of the trailer. In fact with the changes people are inclined to make to their trailers different items can be deceiving.
There are folks out there that don't like the red decal so they order the gold, which is for the Deluxe models, and put them on. One would deceived by just looking at the exterior of the trailer.
I asked about the trailer lights
because that could be a decider but then there are folks who have put round LED lights
on which give the appearance of the old round style lights
. Just food for thought.
The VIN is the best measure.