You can squeeze 32s on with no issues. I just threw on some 265/75/16s and they are 1.4 inches higher than the 31's (actually measure 30.5 or so). Combinded with 16" rims and stuff it made for a noticeable lift.

Balljoint spacers can be bought from sdori or 4crawler offroad.

The best add a leaf setup is the deaver 3 leaf progressive pack wheelers offroad used to offer, they now offer thier own in house brand which should be fine. Should lift maybe 2.5 inches.

Shocks are tough, i would go to ranchos website and check out their catalogue for stock length shocks for other vehicles and see. You can get our stock measurements off monroes website.