FYI, when those batteries wear out, don't replace them with Optima.
Optima are over-priced and under perform.
AGM batteries (like Optima) are not a bad idea. The problem with Optima is their construction actually gives them less capacity then a conventional cell design.
A conventional AGM Group-24 will have more capacity then the Optimas.
2008 F350SD V10 with an 2012 Arctic Fox 29-5E
When someone tells you to buy the same rig they own, listen, they might be right. When they tell you to buy a different rig then they own, really pay attention, they probably know something you don't.