Lift Kits
Currently I only know of one manufacturer with Astro/Safari specific lit kits.
Overland Vans offers 2", 4", 6", and 8" lift kits utilizing a combination of sub-frame spacers/torsion bar/key adjustment in the front and extended shackles/modified leaf spring packs for the majority of the left. For the 8" lift on AWD vans they even went as far as to develop a proper cradle drop.