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The isolator works by charging the main battery before the aux battery is charged. This way you will always be able to start it. This how rvs handle multiple batteries. Check out the video of how they work on youtube. They are inexpensive.

Which imnalance are you concerned with = the 12/24 stock battery system or with a new battery? If you are concerned about imbalancing the stock system don't worry as it is already imnalanced. The only load on the high side battery is strictly starting related- the low side battery does the same...

Research RV battery isolators, you could use one of them. There are a couple of videos on youtube that show the operation of them. You could convert the vehicle to 12v then you could have a dedicated 12v circuit (alternator and battery depending on the method used) to your camper if you wanted.