Same thoughts as Richy2. The reason I went with 2010 Evergreen Ever-Lite. 2012 and earlier Evergreen Everlites did not use wood in its structure. In 2013 wood substrate was added to the roof structure. In the past, our family has experienced wood rot issues in professionally maintained Holiday Rambler RV...Skylark trailer etc. Saw what my parents went through...I will try to avoid the same. Saw the demo videos of Evergreen and at Hershey, PA RV show.. I was sold on the Evergreen construction process and materials used, no wood to rot, no/low off gases, philosophy.