it's not the multi-piece design that makes them illegal in some areas, it's the fact that older ones used to loosen their bolts when driving highway speeds. now you can find some newer designs that are road legal.
as a side note if your not airing down to ridiculously low psi then you are wasting your money. if you already knew that then please ignore that.
2003 Rubicon, 4.0L, 5SPD, Custom 4.75" lift, 33" MT Baja Claws
1999 SE, 2.5L, 5SPD, sold it
PM me for wheeling in and around Northern Illinois