Do you have the factory Heavy Duty Tow Package? If so, you're Expedition can tow 8,950lbs....if not that drops to 6,000lbs.
Your trailer, with NOTHING in it (no LP gas in tanks...no battery...probably no awnings) has a listed weight of 6,700lbs
Toss back in the items from above as at 400lbs.....add food & clothes & camping stuff at say another 500lbs (yes...it adds up FAST...an average case of beer is 40lbs)
Now...do you ever carry water in tank? Your tank is 36 gallons a ~8lbs a gallon....tack on another 288lbs.
6,700+400+500 = 7,600
Add in water +288 = 7,888
So, if you don't have the factory Heavy Duty Tow Package, you're already way over for that rig.
IMHO.....Even with the two package, you're very close to what that rig can tow safely
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