Another thing you can try for the "Thunder Drums" is to do what Phil Collins used to do...
He Pioneered using a simple noise gate with Reverb on Drums...
Find some drum samples that you like already...
Plug those into a reverb and get a good "hall" reverb going...
Then plug a gate on the end of the reverb and crank the decay down to dry it up...
This will give you the sound you want...
It's the "traditional" way to do it...
But I think you'll be happy with the results...
I've found (If you can afford one) is to purchase either an
Alesis DM5 and use the secondary outputs for the sound or maybe shoot for an older model Motiff Rack... (I have the Motiff Not the ES) That particular sound module has a KILLER set of "thunder drums"...
Just some thoughts...
Hope this helps!