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I get you want to buy an extra attack dice for the to hit, but if you roll doubles then what. Is the damage boosted automatically to 3d6, and then if the model hit is slammed into something behind it is it another d6 for 4d6? Does what it slams into matter. If its a medium base, and slams into a large do both take damage, or knockdown? Can small base models slam into large or medium and hurt them? If it only has 1 hp, and gets hit, does it still slam even though the attack kills it automatically assuming armor beat, or only things still not destroyed get pushed back?

Its kind of confusing.

It follows all the normal rules for slamming models. The rule book walks you through it step by step on 33 under being slammed, slam damage, and collateral damage. That is it really. All your questions are answered there. Also for timing, you move the model slammed and THEN you do damage.

Edit: Remember slam damage is based off the attackers str, so whether or not certain models hit with collateral damage can be damaged will depend on the model doing the slamming.