I've thought about that and looked at it. It might help a little, but probably not as much as one might think. On the 60, you can run your receiver and speedo in the center instead of beside the battery. This weight probably equals quite a bit of the parts of the battery that hangs out on the side. So, it negates a lot of the benefit of running the battery up the center. Not completely, but mostly. Besides, the truck handles like a dream now. Why chage it?
One more thing. The speedo is usually heavier than the receiver. By running the battery as it is and the speedo and receiver in the center, you get a better balanced truck.