Redwood is built on an I-beam like most other fivers. Redwood only bought the rights to the former Carriage name and logo and that's it. The Lifestyle by Evergreen is a direct carry-over of the former Carriage line BUT with a lot of improvements. For 2014 they now have insulation in the top of the league. The box frame is still made in house. Lifestyle if of NO affiliation with THOR or Redwood.
Honestly, you can't beat a lot of the features of the Solitude....but I opted for a new Lifestyle for the quality you can't see. For $22k less than a Lifestyle, the Solitude is a nice rig. As far as I-beam fivers, its just a personal preference. Phillip
2014 Lifestyle LS36FW
2013 Chevy 3500 DRW 4x4 Duramax/Allison