You should check the recommended charging regime of your GEL batteries against what the engine alternator might deliver as GEL and conventional batteries are quite different.
I have a rig with 24 + 24 +12 and it can be a bit of a pain when needing replacement 24V items as they are far less common and usually a lot dearer to buy.
However there are big advantages in having the engine and house batteries the same. Emergency starting from the house batteries is one and for instance, once I drove half way around Australia running the engine from the house solar system after the engine alternator died
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