Jeff, If the tow vehicle is for the Argosy I think you will find the normally aspirated 6.2 a marginal engine, at best. The PO of my '75 Sov (GVWR 7100#) couldn't pull the local hills in North Jersey (where I lived at the time) at anything better than about 35 mph. What does your trailer weigh? About 5500 or so? Matt