Ok, let me see if I can get this thread caught up.
I finished the battery mount under the truck for the auxiliary battery. It was shortly after that when I was working on connecting circuits up to the fuse block that I arc welded my titanium wedding band between the positive terminal of the battery and the fuse block mounting plate. Hard lesson to learn but it's always the things that you take for granted that bite you the worst. Ended up with 3rd degree burns and a pretty bad scar out of that little mishap. I'll spare you the pictures.
The Victron battery monitor and Blue Sea ML-ACR works fabulous! I love having real numbers to know how much power has come out, what's going in, and what percentage I'm sitting at. I don't use the Bluetooth as much as I thought I would but it's handy for making the initial programming and setup. I find that the fridge uses a little less than 1 AH and I can easily run for 48hrs before I have to put a charge back into it.
Recently I finished up wiring all the USB's and power sockets in the cab which means that everyone has plenty of power for their devices and my fridge monitor can stay powered without cables running all over the cab. I also added the 300A fuse on the Aux battery positive to cover both ends of that cable run. I even found the labels for the switches and fuse block to label the circuits.
Overall, I'm very pleased with how this has turned out and it has definitely given me the peace of mind I was looking for.