Chassi battery cable, what guage?

Thanks to all. I'm up in the mountains and closest auto store is 40 minutes. Made some calls, even Fleetwood was stumped for replacement part or gauge, escalated. Meantime I found a marine shop, and although expensive, they made me one bad ass cable even bigger. This one won't break! A couple of washers and back in business. Thanks for the quick responses. Nice to know there is help out there when it's needed.