What are the actual specs for towing and tongue weight on the '08 Sport Trac Limited 4X4 with the V8 and a Class 3 hitch factory installed? I see various tow capacities listed in Ford's official documentation from 6600-7000 pounds (for this truck) and nothing for tongue weight. I'm assuming the tongue weight is the standard 500 pounds but the rest I am unsure of. Can anyone help? Thanks!