I tow a 21' Toy Hauler that weighs 6700# dry, 8800 when I roll out of my driveway with full fluids, toys, etc. With 35" tires, I strongly, strongly recommend getting 4.56 gears. This is usually what it will take to give you your stock final drive ratio back, maybe a little lower which will give you extra torque. I have 35" Coopers on my 07 f150 screw with the 5.4 (efans, exhaust, edge, super springs, CAI), and I can tell you your trailer will work HARD pulling something over 7k up a grade with 3.73s on 35s (I did it once before I got my gears swapped). My trans hit 230* on my way back from pismo beach this last spring, you really will need the extra torque from lower gear. Also, take your truck to a scale, my "dry weight" was supposed to be 6100#, but even with NOTHING in it, it weighed 6700#s on the scale. dry weighs are usually about 10% more than they list. your truck will handle it, but you might have some white-knuckle moments towing that large of a trailer behind a light-duty truck.
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