whynotfab
+1y
What size tires are on the 18s? You can lay without tubular arms, most people just run 2" drop spindles and de-hump the LCAs, sometimes trim a little off bag cups. tire size will determine if you can keep the inners, and if not, what needs to be relocated.. also if you need to notch for the tie rods.
it can vary from truck to truck but ive read that 225/40/18 can lay with spindles/stock arms/pulled inners/relocated blower box, computer, fuses, abs, coolant, washer fluid.
while im pretty sure a 35 series (or 25" and under i think) tire will lay (possibly rub if rolling while laid out) but still lay with inners and without notching for tie rods.