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Wire two six volt batteries in series. + of battery one to - of battery two. That gives you 12 volts at the positive of battery one to the negative of battery two. Verify that with a volt meter.
Wire the second two batteries the same way and verify the same 12 volts.
You now have two seperate banks of batteries producing 12 volts and roughly double the amp hour life (capacity) of one individual battery.
Now wire the + of bank one to the + of bank two, and the - of bank one to - of bank two. Verify you have 12 volts from the combined + terminals to the combined - terminals using a volt meter. If you do, then you have it wired correctly and should be able to connect them to MH system. If not, then double check the wiring and verify you do not have a bad battery. That required a load tester.
You now have essentially four times the amp hours available of any single battery.
Now the caveats, if the batteries are not of the same age and capacity they will draw their ampacity from the weaker battery or batteries. Also, this system will take a long time to charge all those batteries.
Another option would be to wire each bank to a battery switch like we do with boats. You could then choose bank one or bank two or both.
I guess the most obvious question is why all 6 volt batteries?
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