Outer Limits 4x4 Board

for a zook:
tyres
locker/s
gearing....
would be pretty capable, get around the lift problem by cutting

for other rigs, same but lift instead of gearing

For a Lux

1. Rear locker (you could have slicks and still go everywhere)
2. 2 "body lift (this will expose your chassis rails, less damage to
panels etc. means no extra mods to suspension, but will give
clearence for bigger rubber)
3. Some good 33 muds.

(and then just sneak in all the other little jobs when missus isn't lookin
like diff gears, dual transfers, bigger rubber, body lift, bar work, X-over steer, full sik sub woofer, front locker, snorkel, coil over rear, wrap bar, )

the 1st three will get you most places.