The "Tank" - Big, Grey and Ugly ..

[YNOT]

Now a question!!

The suspension - I've read other threads regarding spring spacers, but I'm thinking of putting 30mm spacers in. What are the pros (apart from lifting the guts off the ground) and cons. I have heard it makes the ride "coarser" and more rigid because it's actually compressing the springs a bit, but is that correct? Does it affect the flex? How? Etc.

Thanks a million in advance people!!

All spring spacers will do is lift your Patrol. You're not adding weight fitting them so they won't compress the springs.
In your case your shock absorbers are already to short for the lift you have so you risk loosing an inch of suspension travel on compression.
I would be fitting a Superior bent upper arm before you do any other suspension modifications.

Tony