Mike,

For it's worth, I was having a chassis flex problem with my truck too. The nitro motor mount was designed to help minimize chassis flex, and since that is now gone, my battery tray does double duty now. I have my battery tray mounted on 4 short, 1" diameter, aluminum standoffs and I ran these down the length of the chassis for mounting. They have now taken the place of the nitro mount and effectively minimize the flex. My battery tray is carbon fiber with a 1/8" think aluminum bottom and is very rigid.

As for the finedesign mounts, you really have to see them. When we first pulled them out of the box, my first comment was that they looked like ear rings. They were not very substantial at all and made mounting the battery awkward. I'd stay away from finedesign. Support after the sale is non existent. When trying to figure out the battery mounting hardware, we called Chris Fine and his response to us was, "you're hobby guys, figure it out."