Wanting to add storage over garage
The only answer for removal of those angle 2x4s is no, it is not possible at all unless a major reinforcement of the ceiling and roof is done.

The members that make up the roof are set so they work together as a whole, and to remove one part will severely weaken the whole truss that the piece was removed from. Remove one piece from more than one truss, you may, or will have catastrophic failure on your hands.