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It looks to me that you understand what you need, and have it together. The tranny cooler is a good idea.
If the OEM tires are "P" (passenger), not "LT" (light truck), I would seriously consider upgrading them. LT allows Load Range C, equivalent to the old 6-ply, "D"~8-ply, "E"~10-ply etc.
The TT (any length) will drag a lot more wind than the trailered Bronco. It wouldn't hurt to plan on 55 mph on the flats, if you can take the pace. Large hills might be slower, and the truck will thank you for somewhat less than wide open uphill.
Have a great trip and keep us informed.
Wes
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