Lowering hitch/raising pin box is going to cause you whacking the top of bed rail...not good
Blocks between axle tube and leaf springs.........NOT the way you want to lift trailer.
Cutting spring hangers off.....welding in steel box channel in the height needed (2x3, 2x4 etc) with lateral bracing then welding spring hangers back on IS the proper method for lifting trailer
***Spring hangers with adjustment holes.....why frame mfgs don't do more of those is big question.
Mine have 3 holes for adjusting location of leaf springs. Each hole add/subtracts 1 1/2" in height. I just had to relocate my spring packs to level 5vr and have 7" bed rail clearance
LCI Correct track is a means of 'aligning' trailer axles...added benefit it adds 2" in height
That is something you should check out FIRST
Otherwise.......lift trailer via subframe
LCI Correct Track (bolt on ---weld on available also)
Trailer Subframe Lift with lateral bracing