What you need to do is look at the sticker by the drivers door and find your payload capacity.
gross vehicle weight minus curb weight equals payload.
Now add the weight of all passengers and gear you plan to place in vehicle plus 15% 0f trailer weight (Hitch weight or tongue weight)
MY guess is you are WAY over.
NB:
I looked up the specs and supposedly your truck weighs about 6800 if 4x2 more if 4x4with a gvwr of 8600. That gives you a payload of 1800 lbs. The trailer hitch weight is about 1400 lbs leaving 400 lbs for you, wife, pets, tools and whatever else you plan to carry in the excursion.
https://www.ford-trucks.com/specs/2004-2/2004-ford-excursion-specifications/