artic fox

Thunder is certainly one of the "good ones" their relationship with Northwoods is such that they are usually the dealer that gets Northwoods "one-off" rigs that they build as prototypes.
Another one of the good ones is Sumner RV, near Tacoma WA.

But if I was coming from the east, I would probably recommend Thunder, then stay in the greater area for a week or so to try and ensure there are no hidden issues, then head home.