flip your ball joints and u can lay with 18" wheels.
If you want to run a bigger wheel, you will want to do a 5 lug conversion and u can run a dropped toyota spindle.
You can kinda see lower ball joint on this airbag howto for mazda trucks. Next time I do one i'll make a better tech article on just that.
http://www.minitrucksonline.com/tutoriaux-d6.html