The biggest facts about these brands...
*TMC makes most everything standard equipment. The MSRP includes almost everthing available from the factory:
*TMC and Tiffin use flash bonded (heat/vacuum) laminate walls. Newmar uses a "Hung Wall" (skin glued on to the frame of a pink insulation stuffed wall).
Hung Wall has a cult following, but Tiffin reports 11 times higher strength.