Model · Entegra Coach
Entegra Coach Cornerstone
The Cornerstone was Entegra's flagship: a 45-foot tag-axle diesel pusher on a Spartan K3 chassis with a 15-liter Cummins engine of 605 horsepower. Price-guide list prices rose from $588,291 in 2014 to $985,980 or more in 2026, when a Reserve edition limited to 20 coaches was listed at $1,116,480. The 2026 model year was the last built by Jayco before the line moved to Tiffin.
Photo: RV.com (brand photo)
About this model
Federal recall records name Cornerstone coaches from the 2012 model year onward. The 2018 brochure describes a Spartan K3 raised-rail chassis, a 605-horsepower Cummins ISX with 1,950 lb-ft of torque, an Allison 4000 MH transmission, Aqua-Hot 450 hydronic heat, a 12,500-watt Onan generator and Entegra's X-Bridge frame bracing. By 2026 the engine was the Cummins X15 of the same output, the fuel tank had grown to 175 gallons and the Reserve edition added exclusive paint and decor. On May 5, 2025 THOR announced that Jayco would build 2026 Cornerstones through the end of 2025 and that Tiffin would build successor coaches sold as 2027 Tiffin products.