1½” x 2” Stud Wall Construction on 16” Centers (Non-Slide & Small Slide Models)2” x 2” Stud Wall Construction on 16” Centers (DSL Models)Diamond Plate Front Rock GuardCambered I-Beam ChassisAlko Leaf Spring Axles30lb LP Bottles with CoverTandem Axles with Electric BrakesFresh Water Tank with 1½” Quick Drain Valve15” NitroFill Nitrogen Filled Tires with Spare14” NitroFill Nitrogen Filled Tires with Spare on FS180 & FS2705/8” Tongue & Grove Plywood FloorFull Walk-on Roof with 3/8” DeckingRoto Cast Holding TanksR-7 Fiberglass InsulationProtected Wrapped Polymax UnderbellyRear Bumper with Sewer Hose StorageRain Gutter with DownspoutsLarge Support OutriggersEPDM One-Piece Rubber RoofDual Marine-Grade Exterior Speaker System30 Amp Power CordLarge Exterior Storage PlusPremium 3M Graphics TapeDouble or Triple Entry Step26” Main Entry Door (Non-Slide & Small Slide Models)30” Main Entry Door (DSL Models)Screen Door with Kick PlateCombo Flush Entry/Deadbolt LocksPatio LightTinted, Radius Corner, Clamp Ring Windows.024 Thickness Exterior Metal