The problem is how the chassis is shipped.
The treads/wheels at their maximum extension warps the whole chassis.
I gave up and put Wild Thumper Wheels on mine.
I did try and take the “warp” out, but with tracks/treads both wheels need to be absolutely parallel.
This is how I pimped mine out.
And the video!
http://www.youtube.com/watch?v=43zqBtQyBF0
You get way more ground clearance with the Wild Thumper Wheels as well!