The Cummins ISL9 pushing 450 horsepower and 1,250 lb-ft of torque on a Freightliner XCM chassis puts the 40H in genuinely capable territory. This isn't a coach that struggles with mountain passes. Inside, the fit and finish punches well above typical Class A expectations: heated porcelain tile floors, solid hardwood cabinetry, XL custom hand-laid tile showers, and residential Apex furniture throughout. AquaHot 450D handles heating duties, backed by a 10KW Onan generator and six AGM batteries for off-grid staying power. Options like Starlink, an exterior freezer, Hide-A-Loft electric drop-down bed, and a second full-day 90-inch slideout tray let buyers tailor the 40H pretty substantially from the base configuration.