Hi I have the same problem with my 07 D4D. After reading a couple of posts on here I lifted her up and changed the power steering fluid, bled the system, and soaked all ball joints plus steering column swivel joints in WD40.
The results were amazing. Best it had been in my ownership. However, this was short lived. (4 months). I am very reluctant to take the car to any old grease monkey as I do not want to be stuck with paying for unnecessary repairs. I would still like to know of any garage / mechanic near me that knows their way around a Land Cruiser. As my days scrabbling around under motors are far limited to what they were.
I am reasonably close to junction 6 on the M25 and would be greatly appreciative of any help.
Many thanks.