Considering moving from a truck camper to a travel trailer to accommodate a growing family. We camp year-round. We are narrowing in on Keystone and/or Jayco models based on floor plan (bunkhouse) as...
I love my Jayco (both of them in fact) but I wouldn't consider them to be a true 4 Season TT -- even if you get the Polar Package or other insulating packages.
IMO a four season trailer is more than just some extra insulation...one true way to see if a mfg is serious about year round use, see if you can get double pane windows.