Really should 'level' the trailer for best towing.
*Lower hitch/raise pin box ----BUT need to maintain at least 6" bedrail clearance
*Raise 5vr by changing leaf spring position in shackles IF you have multiple adjustment holes in shackle mounts. (lowest hole...max height)
*Install LCI alignment kit-----aligns axles and adds 2" in height
*Install lift blocks on each axle with longer 'U' bolts (NOT recommended)
*Add subframe in height needed.....cut shackles off/weld on 2" x 'X' (4" etc) thick walled tubing to trailer frame/weld across tubing for lateral support/weld shackles back on
Those are your options
May need to utilize one or more to achieve level tow set up
Example: Subframe AND LCI Alignment Kit
(EXTREME Example of LIFTING)