Got lucky with the radiator damage and have been driving/wheeling the k5 since then, even a road trip down to Texas haha. Interesting little problem today. Exploring some of the easy trails around American Fork Canyon today when I started hearing a loud/heavy banging noise under the hood. Guess the sheetmetal isn't up to the task of the second battery mount (the one in the corner behind the lights). Ripped the mounts out of the fender, and ripped the core support where the fenderwell attaches to it. So this thing is down to 1 battery now.
First time having this problem on a square body but this truck has always had overly large batteries (military followed by the big group 48's) and has spent alot of it's life offroad.