cut out the rockers weld in square tube, rocksliders and rockers combined.
search in the xj tech for erics write up on his, you can get a general idea and go from there, he cut his higher for better clearance not for rust but it is probably the best way to replace rockers in my opinion
2013 JK 4-door Sahara in Dune, stock for now
2010 JK 4-door Black, bead locks, 37's, 5.13's, mopar front bumper, warn rear bumper
1998 Cherokee, 33's. 4.56 gears, locked front and rear
2007 Dodge 1500 Laramie, Hemi, 20's, 33's, all the goodies.