Bead-foam insulation (R-9 in floor and R-7 in walls)Cabinetry crafted with screwed-stile constructionElectric-powered slideout (select models)FRP smooth fiberglass sidewall exteriorsOne-piece, seamless, rubber roof materialTuffShell vacuum-bonded laminated roof and sidewallsUnitized, 1-1/2" laminated construction of floorWelded tubular aluminum sidewall and roof frameworkCable support system for bunk ends (interior mount) (expandable models)Bead-foam insulation in roof (R-9 in expandable modesl, R-17 in non-expandable models)