I can see issues with blocks if raised too high, or if blocks not of high quality. I would be hesitant to raise a trailer using the lower set of hanger holes without additional support.
The hangers are pretty flimsy to begin with, and the additional torque side to side might well be an issue. With that said, I did that on my current trailer but had 2" square tubing welded across the trailer from one hanger to the opposite side hanger. Just a lot of cost and trouble.
the Correct Trac system looks interesting. Wonder if most shops are set up to do an alignment with it?