One of our members has towed with your exact vehicle, if I recall correctly. Either scan down the titles in the Towing Rigs forum, or use the search tool on Lexus (or something similar).
My personal feeling is that I would not even try the Rockies or the Sierras with a 3500-rated vehicle. My Explorer is rated at twice that, and though it is adequate at high altitudes and steep grades, it is not much more than adequate. But other opinions may vary. If you decide to try it, I would definitely suggest you get a Scan Gauge or AeroForce Interceptor (or other meter) so you can at least keep an eye on transmission temperature. The tranny is probably the most vulnerable part of the drive train, and trannies are EXPENSIVE!
Bill
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