HZ/WB bars may not stop all cracking, but they certainly help prevent it. That is why you can still find good, uncracked HZ and WB chassis with the bars not cracked, but plenty without them and with cracks. I'm not sure when the bars became optional, possibly with RTS geometry. I used to have a HX tonner chassis with RTS geometry (chassis is still out at Greg's) and from memory it had the holes for them.
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