I'm with PegLW.... We love our Open Range...ours is a 2010....had been used 2 weeks, got a heck of a deal on it. :) :) Check out that Open Range forum.
I saw your question after I posted, so I'll give you our info. We've been full-timing in our 337RLS fiver for almost 1 year. NO problems with the way it was built, just added our own "bling" to it. :) We have been in 105 deg temps (face it, we needed 2 generators -- we were boondocking), we've been hooked up to elec. in 108 deg temps and the rig kept COOL! We've also been in Quartzsite, AZ when there was snow on the hills around us and wind blowing like hades and it kept us warm. :) :) Did I say I'm happy with it?????????