Check out the Rugged Ridge tray. I purchased mine at Jeepin Beach Jam for $80. After that, check with your local Freightliner dealer for an isolator or BEP marine for a switch. Cheapest and easiest way of doing it. You can get heavy gauge wires from a welding supply store or tractors supply.
Treat the batteries under the hood as a single battery and wire your “extra” battery as if it is a second battery.
Your factory batteries are wired and treated as a single unit of massive capacity.
What is your budget? I’ll be installing a Rugged Ridge dual battery tray with stock Interstate batteries and a Freightliner isolator (100A continuous duty for $16).
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