Sun Valley was never a Forest River brand and went out of business after the 2008 model year line.
so, i suggest you go to a RV forum website, like RV.net or iRV2.com, that's not a specific brand owners forum and there are owners of all kinds of different brands represented. you'll get better reponses there and maybe some from other Sun Valley owners.
i think Evergreen RV bought the Sun Valley name for a new line of trailers.
Dan-Retired California Firefighter/EMT
and Zoe the Wonder Dog(R.I.P.)
2016 PrimeTime TracerAIR 255, pushing a 2014 Ford F150 SCREW XTR 4x4 3.5 Ecoboost w/Max Tow Package
4pt Equal-i-zer WDH and 1828lbs of payload capacity