Hate to say it, but your issues with towing mileage is NOT the fault of Gulf Stream or some defficiency in their camper. They are particularly light-weight campers and don't have any extra height.
I'd politely offer that your tow vehicle is borderline inadequate. I have the 300 hp 5.4L and optional 3.73 gears in my Expedition. I get ~18 on interstate, ~14 around town, and ~9 while towing my 255BH.
I had a 4Runner with towing capabilities just a little lower than your truck. At the time, I had a 5,000# boat I towed around. Got over 20 MPG without a trailer and, literally, 4 MPG while pulling that boat at 60 MPH.
Trailers weigh a lot and catch a lot of wind. A V6 is not the way to go, that's for sure. Only a lighter/lower trailer will improve mileage. Unless you go diesel, there really is no way to get much over 10 MPG with any tow vehicle while pulling a full-size travel trailer of any length.
Whoever told you that your mileage wouldn't drop that much was obviously trying to sell you a trailer! And don't think that buying another brand of equal trailer will help...this is a simple matter of physics.
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