Would a 6 cylinder f-150 be adequate for a 19 ft hybrid weighing 3700#. I,ve only towed a popup with a minivan and have no experience towing something more than twice as heavy. it is the extended cab model. The owner says it has a tow package but the only evidence of one seems to be a port for the wiring and an icon on the transmission lever so what does "towing package mean? lou loibl