Lot of discussion regarding batteries so here are my two picks for the money
You gain significant amp hours with 6 volt
If you're keeping a rig and don't like a lot of battery maintenance then AGM or lithium
Battery cables will fail over time due to corrosion as well and post need brushed
Now if you seldom use your battery bank then go cheaper
T105-AGM_Reliant_DS_Final.pdf27AGM_Trojan_Data_Sheets.pdf