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I'm not sure what the rules on a Deffrolla are but the rules for the rockgrinder so I've heard are:

●auto pass dangerous terrain test
●Rams add an extra D6 to S of the ram, if it causes a pen hit add 1 to the result of damage table
●When performing a tank shock, each enemy the vehicle travels over must take a initiative test before taking a morale check. If the init test is passed, the unit avoids the grinder, but failing they suffer D3 S10 Ap2 hit. If the enemy unit makes a death or glory attack on on the rockgrinder and fails to stop it, the unit suffers an additional D3 S10 AP2 hit.

So I'm going to say.. yes