Here's how I look at trucks:
Thunder works excellent with DLX boards. Thunder is owned by DLX after all, so its ment to be.
Either way. This thing with wheelbase regarding thunder vs indy's, is it really relevant?
Thunders are shorter in height, and you can also alter the leverage with wheel size.
EDIT: In Ben's vid he says the difference in wb is like 6,35mm. Thunder's are around 2-5mm shorter, depending on size and baseplate.