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Earlier this year I traded my 03 Tundra with the 4.7 for an 07 with the 5.7. The 03 pulled my 75 Trade Wind (5000 lbs) fine, but was a little under powered on the steeper hills. The 5.7 is a brute with over 400 foot pounds of torque. With the 5.7 you also get the 6 speed transmission instead of the 4 and because of that my gas mileage is better with the 5.7. Your 20 foot trailer is pretty close in weight to my Trade Wind and you want to go to the mountains. The 5.7 is what I would suggest.
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