2014 Jayco Seneca 36FK, 2014 Jayco Seneca 36FK Your wait for the perfect ride is over. Meet the 2014 Jayco Seneca — our most powerful ride yet. Built on a substantial Freightliner M2 chassis, Seneca ups Class C performance with a Cummins ISB 6.7L 340 HP engine, heavy-duty rear air suspension and a 10,000-lb. rated hitch, so you can go anywhere with just about anything. Your seatbelt should be the only thing holding you back, and its luxurious interiors should be the only thing persuading you to stay put.