2015 Jayco Precept 35UP, 2015 Jayco Precept 35UP The world is yours to conquer in the 2015 Jayco Precept. Built on an enhanced Ford F53 chassis, this Jayco Class A blends comfort and handling in one of our most luxurious motorhomes yet. Designed for people who love to travel well, Precept exceeds expectations right down to the details in our well-appointed cabs, functionally beautiful kitchens and comfortable master suites. So raise the bar with Precept.