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When you get tired of replacing the tie rod because it just got bent from hitting another rock!
DACriss
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LMAO /ubbthreads/images/graemlins/biggrin.gif
IMHO, At 8" it is a nice but not absolutely necessary option. 10" and bigger I would say you had better get X-over. People will tell you you don't need it till 12". My experience is 10"
FWIW,
Tom