Well, you're not getting much response. I suspect it's because you are wanting to tow too much trailer with not quite enough truck.
The 2015 F-250 CrewCab 4x4 with gas engine and 3.73 axle ratio has a tow rating of 12,000 pounds.
The Heartland toy hauler T285 has GVWR of 12,800 pounds. If properly loaded to the gills to gross 12,000 pounds, then with a good WD hitch, your hitch weight would be 1,660 pounds. 1,660 pounds hitch weight is a big chuck of weight to come out of the payload capacity of the F-250.
If your truck has the optional 4.30 axle, that ads 500 pounds to the tow rating. But you'll still be straining the drivetrain when towing in hills or trying to climb a mountain pass.
If I had that truck and wanted to tow a toy hauler TT, I'd look for one with GVWR of not more than 10,000 pounds.
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Grumpy ole man with over 60 years towing experience. Now my heaviest trailer is a 7'x16' 5,000-pound flatbed utility trailer, my tow vehicle is a 2019 F-150 Lariat 3.5L EcoBoost SuperCab with Max Tow (1,904 pounds payload capacity).
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