Another vote for the 365 Telegizmo. My concern also is moisture from the ground up. I don't leave it out for long periods, but it's handy if you know there's going to be a few nights in a row clear.
Something also hadn't thought of, but noticed the other day. Ants. They love the cool, dark under there. Something to consider.
Another point is that if you get the tripod cover as well as the scope cover, is that the tripod cover is loooong. I stupidly assumed it was a one-size-fits-all like the website hints at, and didn't specify a length. I'm going to have to get the bottom cut off by quite a lot, maybe 300-500mm. So if you're ordering one, make sure you measure up and let them know so you don't have to mod it yourself.
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