Probably will end up just doing welding cables. I can source some within my budget of nothing and make them last for a while.
That's what happened to me at @thekidcatcher property this past January. Temperature dropped to the 20's and we hopped in the truck to go back to the cabin after hunting and my main battery was dead. Flipped a switch to bring the secondary online and the truck fired right up.Good timing bringing this back up. I was thinking about some of this when I was in Big Bend and what I could do in different situations. A dead battery really only leaves one or two options and most of them require a 2nd good battery.