I would use small angle iron to put over the edge of the battery and use 1/4" all thread angled towards the center of the battery you want to hold down. Another thing I would do is use Never Seize on the threads. That stuff can be a real life saver when it comes to unscrewing nuts or bolts. Those straps could only be as tight as you could pull them.
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For now 1996 Dodge Ram 5.9 Cummins 365HP 830TQ pulling a 2006 28' Dutchmen Fifthwheel and at times a 16' boat behind that!
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