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That's exactly what it will do. And that's not just my opinion, that's electrical fact. As was mentioned above, build your custom battery racks and wire them as I diagrammed, and you will be good to go.

Nope. :D You want two (or 3, or 17, or whatever number) batteries in parallel for your 12v bank, and two (or 3, or 17, or whatever SAME number) batteries in parallel for your 24v bank. The 12v bank is in series with the 24v bank, just the same as it is now.

It's a completely unnecessary complication which adds another failure point. These trucks have lived with a battery imbalance since the day they left the factory. It's designed that way. That's why it's got 2x12v alternators intead of one 24v alternator. Each alternator takes care of topping...

Same capacity for the front battery and rear. That's the only option. Of course, they can be physically located wherever you want, even under the bed. All it takes is a little fabrication for a mount and lots of copper to connect them. :) A bunch of lawnmower batteries could be wired in...

Good so far. Nope. Doesn't work that way. You aren't accounting for the internal resistance of the batteries. When you connect batteries in parallel they offer a lower resistance than the one battery. Good so far. But they are in series with the battery up front. This battery does...

I'm in agreement. Unless some of the rear is going to power some isolated ground 12v units, I don't see this working.

Cool beans. Oh,, I wasn't thinking of the fan particularly, just in general once you get all the extra doo-dads installed. Yes, it's top notch.

Have you considered using a large cap to provide for sudden amp draws? Like the megawatt audio amp freaks use? It will smooth things out for your radio, too. Hmmm. Have you considered vibration? I'm just thinking out loud here.... The fender mounting probably provides some degree of...

You got it right the first time, sir. If one fails, they are both out. Just like the old-fashioned Christmas light strings. If one blows, they are all out. The only way to find the failed bulb is to start at one end and replace one bulb at a time. To get any redundancy from two fans they...

I'm sorry it came across that way. That was not my intent. I didn't say it was NOT a good idea. My point was responding to what you said. I didn't have any other information. You said simply that you were replacing it because you found out that the mechanical fan robs horsepower from...

The electric fan ALSO robs power. Where do you think the energy to move that air is coming from? It ain't free! An electric fan puts a load on the alternator, which is driven by the engine. "Oh, but the engine is already spinning the alternator, so it doesn't take any extra power to...