I have a 2013 4x4 Expedition with the 5.4L, 3.31 axle, 1499 payload capacity and towing package. No airbags, just struts. I tow the 2017 25' FC Rear Bed with a measured 900 pound tongue weight and 5,520 pound total weight.
I am always very close to that car payload max and rear axle max. With my Blue Ox SwayPro hitch set at 10 links I cannot get the front end down enough to level out the car. Not too bad but enough that with the payload limitations I would jump on moving up to a F-250 if it would fit in my garage. I'd also like to get a diesel for engine braking too.
For power, I have never felt that it was deficient. That is from my limited 3 years of mostly Minnesota roads and one trip to the Hill Country in Texas. No real hills going up or going down. And I tend to drive like the preverbal little old lady going to church on Sunday - slow accelerations and 55 to 62 MPH.
I tried the SumoSprings. They made the ride slightly stiffer and helped with the rear end sag by about 1/2". It still drops a lot before the WD hitch is set to 10 links. I might go to "cargo springs". A shop here says it should help with the sag, make it ride like a F-150 and cost about $900.
I would recommend getting a scale like the Sherline Trailer Tongue
Weight Scale and measure your trailer tongue weight when it is ready for a trip. Weigh your current vehicle empty with just full gas and driver. Then load up your current vehicle with all your stuff and passengers as if you are going on a trip for a couple of weeks and re-weigh. Subtract the two to get the actual cargo weight and add in the tongue weight. That will give you a pretty close payload weight to use when you car shop. Always look at the sticker in the doorjamb of the vehicle before anything else as that is the number that is most forgotten.
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2017 25' Flying Cloud
2018 F-250 6.2L Gas
Blue Ox SwayPro 1000#
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