I have searched and haven't found anything venturing down this path.

We just recently picked up a 2022 Defender 110 X-Dynamic HSE. It has the 3.0, so the 48v "mild hybrid" system. I have been doing some digging and planning on adding a dual battery setup. With the concerns of the LR DC converter failures, I am looking at pulling power off the 48v side of the system before it gets to the LR DC Converter to charge the 2nd battery. Should alleviate extra power draw from the 12v system and hopefully extend the life of the LR DC Converter. A 48v battery has more "capacity and efficiency" over a 12v of the same size. This brings up a question:

Has anyone installed a second 48v battery and stepped down to 12v to supply power for overland accessories? Anyone have any experience or thoughts on going 48v vs 12v?