im not entirely sure about the zipper lengths, but I believe that the XLT is taller and slimmer than the XXL, and that the XXL is more of a true fit (which will be pretty fat because it's an XXL).
That said, TNF doesn't make super baggy gear, so even if you bought the XLT it would not be very big on you. If you want tall stuff look in to FD wear or even Saga, they're the only companies I know of that make technical outerwear with similar specs to the Gonzo that runs more than 40" tall (which is what you will need if you want to rock the thug look at your height.
Sorry for my lack of solid facts but I hope this helps
I'm curious about the zip on the xl long gonzo as well? Anyone have one they could measure?
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XXL Saga is absolutely massive. I'm 6'5-6'6 215 lbs and it was HUGE on me (I like a tall somewhat loose fit, not ridiculous). I currently wear XXL Oakley (loose fit & anorak length) and would wear XL Saga if I bought a coat from them.