If you exceed the towing limitations for your vehicle, you void your warranty! The maximum towing limits are NOT for a dry weight trailer. They are for your trailer loaded exactly the way that you will be using it. Water, food, furnishings, clothing, chocks & blocks, black water drain hose, electrical connections, et., etc all add a LOT of weight to the trailer.
If you overload your vehicle with people, gear, etc., AND an overweight trailer, you will also strain the heck out of your engine, transmission, rear end, shocks, wheel bearings, etc.
It is FAR better to get a vehicle DESIGNED to tow the kind of weight you are describing. If I were you, I would get an F-250 or an F-350, put a camper shell on the back so you can load your canoe, etc.
If you can't use a pickup, then look at a Chevy Suburban! (I know, it's not a Ford, but it is available with the load levels you are describing).
I made the mistake of overloading my Expedition too many times, and destroyed my transmission (which was NOT covered by the warranty).