We had an Expedition...and towed different and much lighter trailers with it for years.
We have an Arctic Fox 25Y on order.
The weight you are quoting for the Fox is the dry weight (GVWR is 10,000 lbs)
My opinion...you are asking an awful lot of your Expy.
Also as posted...look at payload, not tow rating. Realistically trip loaded you are looking at 1,200 lbs of tongue weight or more.
"If we couldn't laugh we would all go insane."
Arctic Fox 25Y
GMC Duramax
Blue Ox SwayPro