Nonmetallic won't rust, but it can sag in very hot conditions. The usual solution for that is more closely spacing the conduit clamps or supports. Painting it can help protect it from UV from the sun, but then it becomes a maintenance issue since it will need to be repainted every so often.
There's a small jib crane called a Skyhook that's designed for lifting heavy parts or replacing chucks on a metal lathe: https://skyhook.cc/premium-tool-post-mount-sky-hooks.html Also, if you search on 'mini jib crane' some other products show up that are bench or floor mounted but are...
There are floor mounted jib cranes available from a number of sources. This is a link to the Grainger catalog section on them, not that you have to buy from Grainger but it shows what kind of cranes and capacities are available...
I never thought about that - a square pole can often have a twist so the faces aren't flat, but if there's a twist in a round pole it won't matter, it's still round.
If it's cold enough long enough, stuff in a fridge in an unheated garage is going to freeze unless it has some sort of heating element to keep the interior above 32F.
If you're storing drinks only, you could look for a used soda vending machine that's designed for outdoor use. They do have...
He's had a number of different discussions over the years, these are the two latest (it seems the search function over there only lets me search back 3 months.)
https://forums.delphiforums.com/breaktime_3/messages/15903/1
https://forums.delphiforums.com/breaktime_3/messages/16021/1
That's what I would do. Screw the box to the wall, fasten the controller inside with tape. Or you could use Velcro tape so the controller is removable.
There are still plenty of old homes with existing 100 amp services (mine included) but a 200 amp service is standard for new service installations in Minnesota. I think that's typical in most parts of the lower 48. There are more and more large homes that are getting 320/400 amp services.
THHN/THWN is most often used for common applications like what you're asking, and is available at most hardware stores and big box stores. It will have a 600 volt rating, the difference is in the type and thickness of the insulation. The 60 volt rated stuff you found is likely for DC use, like...
There's a fellow on the Breaktime 3 home building forum who's a retired Lithonia Lighting engineer, he's done some pretty cool stuff with accent lighting in his garage. He's also a big fan of 1960s McLaren race cars, and painted one wall in their signature orange color along with a McLaren...