I did something similar on my Flagstaff trailer when I moved the new batteries inside but I ran one size larger wire to the original location and put a weatherproof box where the battery box was originally. The larger wire size keeps voltage drop no worse than the original setup. Plus I didn't have to get into the enclosed underbelly
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2021 Flagstaff 21DS behind a 2015 Silverado 2500HD
Renogy bits: 3000W Inverter/Charger, 400Ah LiFePo4, 40A DC-to-DC. Rich Solar bits: 400W of panels, 40A MPPT. Misc bits: LevelMatePro+, SolidRemote based wireless controlled LED storage lighting
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