If you keep the car and budget is there buy quality like victron, used a lot in mobile homes: (in europe)
www.victronenergy.nl
not that jiblejable language: Victron Energy
One model (Orion-Tr) has an extra 12v switched on/off (called isolated) to prevent battery drain but I suppose they have a drain protection.
And it can charge an extra 12v battery which isn't bad to use as a spare (eventually one battery will fail and starting becomes, interesting, so then I used a 60 Amp spare for a few weeks and it worked (charged, no fire, no explosion, no egg overcharging smell, no liquid spill) without any problem in combination with a 100Amp.
Chinese brand might be ok if you try to find reviews, some are sand in a box and others seem to be good.
Also a battery equalizer seems good practice but they are pretty expensive, like mentioned by other user (sved?) : Used Vanner Vann-Guard 70-100M Equalizer 100Amp
forum.ih8mud.com
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is a stupid comment
but the truth is that this whole forum could be locked as everything is mentioned and done 
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DC-DC Omvormers - Victron Energy
De DC-DC omvormers van Victron Energy komen van pas als u geen geschikt voltage apparaat hebt en zorgen ervoor dat spanning wordt omgezet.
not that jiblejable language: Victron Energy
One model (Orion-Tr) has an extra 12v switched on/off (called isolated) to prevent battery drain but I suppose they have a drain protection.
And it can charge an extra 12v battery which isn't bad to use as a spare (eventually one battery will fail and starting becomes, interesting, so then I used a 60 Amp spare for a few weeks and it worked (charged, no fire, no explosion, no egg overcharging smell, no liquid spill) without any problem in combination with a 100Amp.
Chinese brand might be ok if you try to find reviews, some are sand in a box and others seem to be good.
Also a battery equalizer seems good practice but they are pretty expensive, like mentioned by other user (sved?) : Used Vanner Vann-Guard 70-100M Equalizer 100Amp

Running 12 volts off my 24 volt system.
So what is the deal with running high amperage 12 volt access off a single battery in a 24 volt system. Does it wreck the alternator? Does it wreck the batteries that are under warranty, so badly that I can take them back and get new ones all the time? Thanks, E. Rockefeller.

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