Entegra built the Cornerstone 45J around the idea that a motorhome should feel like a well-appointed home at highway speed, and the Cummins 15-liter 600HP engine on a Spartan K3 chassis makes that speed effortless. Inside, the Aqua-Hot 450 diesel hydronic system delivers in-floor heat throughout, quartz countertops with dimmable LED underlighting set the tone in the kitchen, and a Bose SoundTouch 130 home theater anchors the living area. The bedroom gets a Tempur-Pedic Cloud Prima King bed and its own Bose Solo 15 soundbar, while a residential-grade Samsung refrigerator, induction cooktop, and dishwasher make the kitchen genuinely functional rather than just impressive on paper. Owners consistently call the ride quieter and crisper than coaches costing far more. Tight slideout seals, Bilstein shocks front and rear, and the Reyco Granning independent front air suspension all contribute to a package that earns its flagship status.
Other class a motorhomes floor plans (around 44 ft 11 in), similar in size and price to the Cornerstone 45J.
