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2 comments of this product found across Reddit:
I went through two cheap ones - basically junk - before finding this one. I think the best brands are probably RavPower and Anker and would suggest this as a possible recommendation.
With a $40 solar panel to charge a large power bank (if you don't charge via your engine) and a $10 USB desk fan, you can do a lot to alleviate the situation, but ultimately shade and hydration and low humidity are always key.