I've been thinking about my tent choices for my upcoming RTW trip, with my focus on the potential cold of spending some extended time in the Andes Mountains and then the next month spending some extended time in the Amazon. I have a Big Agnes SL1, which I know will work well in warm weather, but I'm a bit concerned with the mountains. I plan on wearing multiple layers including full body long underwear, and using a 0* sleeping bag (good call, right?) but what about my tent choice? Do I need something with less ventilation? Thanks for your opinions!