Another thing to consider when adding batteries. Going from 1 12V to 4 6V will add about 200 lb. to the front end (mostly on the hitch). If you are close to the weight limit on the truck, you might do more research on other expensive (lithium?) batteries that are lighter and have more juice.
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Tom and Gail
2013 Mountaineer 362
2012 Silverado 2500
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