If you really wanted to get fancy, you could try to time the photoperiods to coincide with the outdoor light cycle, and get the biggest version of the U-Haul which I believe has a roof that can transmit quite a bit of diffused light. Enough for the plant to consider it day, I think? Then park it somewhere that gets a good amount of sun, and make sure to ventilate well!
No idea how well this will work, but if you run out of all options...
It sounds like your buddy is already aware of your grow(ing), and can probably trust him to take care of it. You probably figured out a solution already as well, and don't need this kind of goofy, so-called "advice".
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