Best way to know for sure is to get exact weights. First load the Excursion with fuel, family and any stuff they would keep in it while travelling. Go to the scale and weigh it. Get front and rear axle weights and combined. Take the combined number and subtract it from the vehicles payload and that is what is left for the hitch and tongue weight.
Next, load the trailer ready to camp and go to the scales again. Get tv axle weights again as well as trailer weight. From this you can determine if you are within payload, axle and tow ratings as well as the tongue weight.
