I've decided that my battery packs will balance the rear of the car and I wanted them to have as low a center of gravity as possible. To do this I had to modify my chassis braces as you can see in the picture. Basically, I ground the profile, and made them solid using JB Weld while extending the front portion, as well. They were then ground flat, painted and re-installed. Why did I do this? My plan is to run 2 2S packs (total of 4S) side by side underneath the drive shaft. I have approx. 15mm(H) x100mm(W) x140mm(L) in which to do this: they won't be hard case packs but that's no problem. Low is good. This placement will actually bring the balance exceptionally close to perfect between front and rear, side to side.