Don't get tunnel vision on that 8700 lb tow capacity. Your Expedition has a tow rating (what a stripped down model with only a driver could possibly pull), a payload rating (what that same stripped down model could possibly carry), gross vehicle (GVWR) weight rating (maximum amount of weight on the vehicle's frame, suspension, tires, etc, and a hitch receiver rating (what the hitch receiver itself, can carry, with or without weight distribution). The various ratings don't always coincide with each other. Everything and everybody, you put in or on the vehicle (passengers, pets, cargo, WD hitch, and trailer tongue weight) takes away from those ratings. In many cases, the vehicle runs out of payload, before it gets close to the mythical tow capacity number.
Due to weight limitations, the size of TT candidates will also, limit the possibilities of adding a laundry.
It is possible to remove a booth dinette, depending on what is underneath. Many units have only storage underneath. Some, may have a water tank or some other systems built into them.
Here are some average numbers to keep in mind:
Average tongue weight is about 13% of loaded trailer weight.
Average camping load (bedding, dishes, camp chairs, pots and pans, groceries, water, etc) is about 1000 lbs.
Average payload in a large SUV is 12 - 1500 lbs. Some have more, some have less.
Example:
Let's say a vehicle has 8700 lb tow capacity and 1300 lbs payload. The driver, passengers, pets, WD hitch, and cargo total weight is 600 lbs. This vehicle would have 700 lbs payload available for trailer tongue weight.
Now lets say the trailer weighs 7000 lbs empty. Loaded for camping, it weighs 8000 lbs. At 8000 lbs, the tongue weight would be right around 1000 lbs. The tow vehicle would be 300 lbs over on payload and GVWR, even though it is 700 lbs under on tow capacity.
18 Nissan Titan XD
12 Flagstaff 831FKBSS
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Retired Navy Master Chief (retired since 1995)