ADC liability insurence

I need some info on liability insurance for ADC. How much should I carry and a ballpark figure of the cost. Also a recomended carrier pleas, thanks.

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A couple "insurance" threads-
http://www.trapperman.com/forum/ubbthreads.php/topics/3106403/Insurance_Questions.html#Post3106403
http://www.trapperman.com/forum/ubbthreads.php/topics/2972214/insurance_question.html#Post2972214