That's a new term for marketing I would bet. I doubt it means heated tanks but I would assume that it means you have a little bit more insulation in the floor or ceiling, an enclosed underbelly and possibly a larger furnace..? There isn't too much they can do. Perhaps it came with 40lb propane tanks rather then 30's. In the grand scheme I would bet it's something insignificant. Good luck.
Working because we have to - camping because we want to.
2015 Salem Hemishere 337 BAR
2014 Ram 3500SRW Laramie 6.7 I6