relocate mount points both in the tunnel and on the rails.
not familiar with the skid/suspension your referring to but most skid mods/relocates are simply a mathematical equation waiting for a solution.
for instance, simply taking the pre 2000 mtn skids and altering them to 141's or longer and lowering the approach angle. simply a matter of moving rail mounts and tunnel mounts.
same theory should apply to what your wanting to to without using rail extensions.