Ya, 8 Trukks will crazy hilarious to roll across the field! Your re-tweak of the BTP list looks good, though i'm surprised with the choice of Rokkits for the Trukks! No doubt to add to the Random mayhem that is to come with this list!
You will find that it will be a bit of a glass cannon.... Trukk lists will indeed hit em fast & hit em hard, but it can crumble easily if your not too careful in how you run em (
AV 10 only goes so far). Thank Gork & Mork we have Ramshackle
Use the table and terrain to your advantage with this list and you'll be Krump'n in no time! With so many trukks, your opponent with be wondering which to take out first. Keep a couple in reserve to reduce early casualties and for objective hunting!
Either way it's going to be great fun going Ramshackle all over the place

... keep me posted.
My "current" main list has 5 Trukks running amuck and isn't much different from this. May just have to try this list my self to see the shenanigans it'll bring!