From what I've read about WDH, I thought the rule (of thumb?) was that if your trailer weighs more then half the weight of your TV...you need a WDH. What I found, says the dry curb weight of the Expedition is 5565 lbs. Your TM is likely over 4000 lbs loaded. I'd say you definitly need a WDH, especially with the safety of a big family at stake. The Ford will handle SOOOOO much better.
We added one to the Highlander and it made a heck of a big difference. I was told i didn't need one either. They were very wrong.
As far as your other questions....I'd find the GCWR rating of the Expedition, and as long as you are not over it, I'd give it a try. That's my very inexperienced opinion though....I'm still learning too.
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