It's an RV charging system splitter. You need to isolate the "car" battery from the "house" battery when charging them by the alternator while driving the RV.
Typically the house battery also gets charged by a charger that runs off 110VAC, either plugged into the campsite power or when running the generator.
Side note, that requires an ATS, or automatic transfer switch. You'd need the same type of switch for your home if you hard-wire a whole-house generator so the guys working on the power lines during an outage don't get electrocuted from backfeed power from your house.
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