Stan Leschert

As has already been stated, the 24V system is a far superior system. I would keep it. As for running a 12V tap off of one battery, I would highly NOT reccommend it. It places an uneven load on an already old and tired system. The weakest part will fail quickly, usually taking out several other key components. The 24>12V invertor is the only way to go. ROBR can tell you where to get them from.

If you require more than 30 Amps, the smart thing to do would be mounting an auxilliary 12V alternator meant for an RV and seperate storage battery. Most alternators now days have a 1 wire connection, and are easy to plumb in. The big pain will be fabbing the mounts. New belts will be required, but just take one of your spares (which you should carry with you) and cut it. Wrap it around your new pulleys, and measure the distance that you are short. Any auto parts store will be able to help you out. When you find the correct size, buy a spare. Make sure to save the packaging so you know which one to buy next time.

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I am a trained professional! Do Not Attempt this stunt at home.
Go to a buddies' place where he can hold your beer and get it on video!