Body lift is pretty much it, there are no kits for suspension lift available. You can use an add-a-leaf, re-arch the springs, or use shackles to lift the back end. In the front, you just crank the torsion bars, but that is limited to about 3 inches of lift. There is a good howto on that over at
http://www.planetisuzoo.com and the luv is virtually identical.
For shackles or other rear suspension options look in the isuzu section over at
http://www.independent4x.com. You can email or call Matt there and tell him what you are working on, he should be able to get you parts that will fit.
If you want more than 3-4 inches of lift in the suspension you would need to swap to a solid axle in the front, or cut and reweld the frame.