I cant add much more to what Ken has said about the 12" I have had mine for 14 months it was bought from Andrews as well, I have had no signs of rust in the tube I took the Delux option as well.
My scope has traveled a lot of Km since getting it 2 Snake Valley astro camps and lots of weekends up at Kens place in the dark sky, it takes me about 5 mins to collimate when I get it out of the car or trailer.
As Ken said it is a big scope to carry, the OTA comes in just under 25Kg.
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