Four-Season Rating
A designation indicating a camper is designed for cold-weather use, typically meaning enclosed and heated holding tanks, upgraded insulation (R-7+), thermal-pane windows, a furnace rated for below-freezing temperatures, and insulated plumbing. There's no industry standard for what constitutes "four-season," so check the actual insulation R-values and tank heating specs. True winter camping demands enclosed underbellies and heated compartments, not just a marketing label.
Related Terms
Double-pane insulated windows with an air gap between two layers of glass or acrylic.
A truck camper with fixed, rigid walls that don't collapse for travel.
Laminated wall, floor, and roof construction that bonds an insulation core (typically EPS or XPS foam) between fiberglass, aluminum, or Azdel skins.