Deep cycle 6 volt batteries give the most performance and usually life for their cost.
My rig came with 4 8-D 12 volt AGM batteries, they cost over $600 each, much cheaper to use 8 $90 batteries but they require more maintenance
2009 45' Magna 630 w/Cummins ISX 650 HP/1950 Lbs Ft, HWH Active Air
Charter Good Sam Lifetime Member, FMCA,
RV'ing since 1957, NRA Benefactor Life, towing '21 Jeep JLU Rubicon Ecodiesel