Second battery bank

I installed 4 deka agm group 31 batteries. Trying to figure out how to change the dry camp batteries and the house batteries while driving. I have also a Magnum ms2812 so I need to keep the agm bank separate. Any idea s

Carl & Christine, 2012 Landmark Rushmore, 2005 Silverado crew cab lt 8 foot bed 6.6 lly /Allison -custom dual exhaust-198000 miles !