Thanks for the info and reference! Their extreme battery cable looks awesome, good to know that's out there!
You will be glad you upgraded when you see how small the stock cable is compared to that 2AWG, it's pretty amazing I never had any problems! Very very lucky!
I did this exact upgrade and didn't swap to a larger wire. I drained the batteries many times and never had problems for years, but this winter after sitting for a long time I did have a weird electrical smell after driving which I suspect was the wire under high charge loads? So I swapped it...