Comment: Pilgrim

it depends on how much offroad driving you are expecting to do. Upgrading the suspension for offroad work can be considered in the same way as upgrading the tyres from the standard production setup.

The patrols and other 4wd's are sold with road type suspension and are not well suited for offroad work. most people who are using these vehicles for offroad work will replace the springs and shocks and in the process do at least a small lift of about 2 inches to help with ground clearance. the difference in performance between standard and even a low end 4wd aftermarket suspension upgrade is quite obvious. the vehicle feels much firmer when cornering and bounces less when on rough roads. if you have kids in the back they are less likely to suffer from car sickness etc.
there are many suppliers of equipment for this purpose but the big names to start with would be ARB and TJM.

On the other hand, if you are only travelling on well made gravel roads such as the Oodnadatta track then a standard car setup is just fine.