after reading up in this thread I will probably take the time to use a metal plate underneath the car where I have the posts installed into the chassis.
but i think ericw is right, if the battery was loose in the back of the car it might be a dangerous weapon, but if it is properly secured I belive the risks will be significantly reduced.
even still, i'm sure its a good idea to use a backing plate on the bottom of the car just to decrease the likely hood that anything would ever happen to the box/batttery.
ps, I have found that using a 250amp circuit breaker (friend with stereo shop sold me this) on my positive (might install one on the negative for when i have to 'disconnect the negative battery terminal....') battery cable.
i have tripped this breaker a few times and it works GREAT, and has protected my car every time.
as a matter of fact, here is the exact part that I have...
http://cgi.ebay.com/250-AMP-CAR-RADI...QQcmdZViewItem
it is super convenient to just press the button to trip this thing and quickly disconnect my battery line without having to mess with the battery box.
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