you should have no problems fitting 35s with the 3inspindle and 3in spacer unless you have some crazy wide wheels with a very negative offset like -76mm or something.
also the airbag it spindles are the same ones that Rough country use to market before they made the 6in crossmember lift. so there is no problem with them on the 02-05. on the 06 you have to watch your tierod end links cause with them you might not get enough thread in the spindle when aligned and snap the tie rod when doing some extreme off roading with it.