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I'm not quite sure what the question is.
Things like a leg of lamb are an awkward shape and I don't have a stockpot so would have had to buy one. The cooler was probably cheaper than any stockpot and I got a load of shit for buying the wand in the first place, so bringing a massive stock pot would have been even worse.
Filling it up is a bit of effort, but not that bad. I usually fill it with hot tap water and a couple of nearly boiled kettles, then let it get up/down to temp. I also use two cheap rachet straps to reinforce the sides now.
One limiting thing about SV wands I would point out though is the container size.
The wands are very big. There is a good chance your biggest saucepan isn't actually as big as you think and water evaporates.
I made a cool box which handily stores the wand, bags, old spoons and clothes pegs for weights.
See here for more details:
https://www.lfgss.com/comments/14779029/
and
https://www.lfgss.com/comments/14779032/