Also the upper suspension mounts could be tied directly to each other left and right; as long as you do not put a lowered battery box in. This was the primary reason I decided not to put a lower battery box in. In fact I think this would be even a better spot for a chassis rigidity mount.
The rear mount would gain the most from a direct connection left and right as the front attach goes right through the steering box. You have access to it from there but the steering box is pretty rigid.
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