The verdict is in – according to Airstream the amount of weight of the lithium batteries is inconsequential. So we are installing everything in Box Number 2. What this means is that the install now becomes easy and the maintenance completely accessible. (see below for diagram) 😁.
This makes me so happy! I will provide pictures of the install in Part 6 once I have all the required parts, (i.e., batteries, ANL fuse etc.) 😎