Yellow top Group 31's for sure IMHO. They also make good start batteries. But Tower's right. Bought them online with tax and shipping for almost US$200 apiece. But trouble free and withstand a lot of violent shaking better than any typical plate batt.
Use them on my Class A for both coach and engine batteries, and will retrofit by boat's two with them soon. Won't hesitate to add them to the H2.
Optimaugs
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