The problem is usually not the vehicles alternator but the voltage drop from the front to the caravan battery. It is such that the caravan battery cannot receive the full recommended charge. Are you sure your new caravan doesn't already have a DC / DC charger? Many that I have seen do. If not, then the charger should go as close to the battery as possible.
Rod.
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2012 JKU Wrangler
2015 WK Grand Cherokee.
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