Dual battery setup

[mister.freeze]

My ‘72 K5 currently has 2 yellow-top Optima batteries that are getting pretty tired. I previously had standard group 31 batteries and was happy with them. Then I lucked into these Optimas and have had them quite a while.

Of the 4 Optimas available, what combination would you use and why? I have 2 batteries because of lights and stereo demand and hopefully, someday, a winch. Or should I go back to the cheaper and more common big rig batteries? Thanks in advance.