We are very happy with our 2005 Designer 31 RLS, which we bought used in 2007. Our TV has since changed from a 2001 Dodge Cummins QC 3/4-ton LB to a 2009 Dodge Cummins QC one-ton dually LB.
We especially like features and options we probably would not have chosen on a new unit, such as thermal pane windows and heavy insulation, slider topper awnings, gel-coat sides and aluminum framing, king-size bed, and more.
There have been no Jayco issues with our trailer. Our few problems have been appliances and other items not manufactured by Jayco.
2005 Designer 31RLS Fifth Wheel, 2009 Dodge Cummins 1-ton Dually (quad cab, long bed) w/6-speed automatic tranny.