I know it is early in your quest for the answers to your questions and I am afraid I can not answer any of those questions However, I would also suggest you add research into filling tanks at home with the Homefill II system or something like it to your quest.
From what little I do know I understand that it takes some hefty concentrators to handle the needs of the bigger torches and often a few of them at once and refilling your own tanks might take some of the $ting out of pulling it all together.
Good luck and be sure to come back and teach us what you learn.
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