I would like to hear some discussion about Nash

You need to remember that the NADA list price includes everything that is "standard". Which for a Nash of that year.. 4-season, AC, microwave and two 12V batteries. Also the awning is standard.

Things that are not: 6v batteries, thermo-pane windows (they are an "option" on all Northwoods, even though something like 90% of the rigs come with them).

Would it make a difference if this is a "4 seasons" version with the enclosed and heated tanks, AC, microwave, 6volt batteries, wdh included?

Check out: http://www.afnash.com/forum.php

We've owned Nash, and yes a 2008 (I'm guessing) Nash is well made, but how well maintained is just as important.
I went to NADA and even after conversion to buying in BC (Bring Cash), $10K (Can) is high. I could get a 19B in Washington for around $6K (US)

Owned a 2002 Fox 19B. Great but small floor plan. Two downsides, cushions are really soft, and lack of a permanent bed means a bad sleeping experience. We had a custom sized mattress made and made the couch into a permanent bed. Warning, they are definitely heavy. Our 19B pulled OK with our Tahoe, but I sure would not want anything smaller to pull it with.

Nash is built by Northwood Manufacturing. They also build Arctic Fox and a new line called Snow River. Most are built in Oregon. Arctic Fox is their top line...

All three lines are considered excellent and all have a great reputation. One plus is that they build their own frames. (don't use Lippert frames).

But, for an 8 year old trailer, condition and how it has been maintained is much more important than the manufacturer.

Aside: $10K for an 8 year old 19B seems high to me..?

Anyway, good luck.