Sounds like a winner.
Sorry it was such a long trek and part of that is just the difficulties in communications. I might have saved you some time but did not go into some details. Things that "everybody" knows type stuff?
I fuss about computer folks doing that all the time but this time it was me!
Some of the details I skipped that might have helped find the ground bus bar?
In houses and "normal stuff, we use the earth as groundand that menas we almost always connectthe ground wires to ground! Some of the preferred ways to get that contact with ground areground rods or water pipes as they often get good contactwith the earth/ground.
But in an RV, that's going to be complicated so the have to find another item to serve as the earth to use as a ground reference and that makes the great big old metal frame handy and we often call it ground!
So the handy way to make sure a ground bus bar is getting good contact with the "ground" is to attach it right on the frame!
Sorry I did not mention that as a big deal on finding the ground! sometimes it those little points that make us sweat so hard!