Sorry, cannot help ya with the grounds much. I was alway told the shortest and fatest wire for grounding.
I once had subs in the back of mine and had the spare tire out to make room for them and there was one bolt that was welded in to hold the jack down I think, I used 4 gauge wire and attached it to that bolt plus I also ran 4 gauge wire all the way to under the hood to a fuse block then to the battery.
After a couple years of it and losing my hearing I decided to take it out and gave it to my daughter
Best of luck with yours, Ed
