Power step. Power awning. Power seat. The ultimate power trip. Jayco Seneca packs more unbridled power in a Class C motorhome than anything in its price range. Built on a Freightliner chassis, Seneca combines a Cummins ISB 6.7L 340 HP engine with a host of high-end interior features for legendary Class C comfort. Put yourself in a whole new power bracket. Put yourself in a Jayco Seneca.