Dodge helps mitigate crushing blows by pushing them "off the table," in addition to parry, block, and being missed. Given the linear determination of an NPC's potential hit consequences (miss, dodge, parry, block, critical, crushing-blow), properly bolstering the evasive possibilities (the first four options) preclude crushing blows entirely. This is why redoubt is vital for paladin tanks (and shield block, for warriors): both skills enhance the chance to block by a high amount, diminishing crushing blow potentiality.
Furthermore, strength only reduces the amount of damage mitigated by a successful block. I'm not qualified to say this mitigation is unimportant: I've got a major in druid tanking and only a minor in tankadins. However, the formula values blocked damage reduction at [(Shield block value) + ((Strength / 20) - 1)]. In other words, 1/20 of your strength reduces the damage you block. Remember that the amount of damage blocked is computed only after armor and defensive stance/ improved righteous fury mitigation, further diminishing the overall blocked reduction. Regardless, strength does not enhance block chance.
In conclusion, dodge is vital and strength (I suspect) only minorly so.
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