A 2" lift is almost an after-market standard for springs (coils and leaves). Have a look at Ironman and use their 1300 number to speak to a human for direct advice regarding their product.
Its not that easy to tip over a Patrol, but it can be done - especially if you have any sort of load up high or on the roof. For what you describe 2" should be fine, but replacement air bags would be a must have. Keep in mind that rather than buying stiffer springs (e.g. +200Kg or + 400Kg) and having to live with the vehicle tending to "skip" when not carrying a full load, you can use the airbags to get a wider (and more flexible) range of options in loading carrying depending upon how much air you put in the bags.
Before you buy anything, weigh the front and then the rear of your vehicle - and then get an all up weight (as a check on the other two) - then you will know what your actual weights are - as opposed to theoretical. Softer front springs are kinder to you, your steering and your vehicle generally, so unless you really need to don't go for stiffer front springs - it seems that the only extra weight on the front you have is the bull bar (+ second battery?). Actual weights are something you can rely upon.
For the trip you are planning you might find it best to pay the extra for foam shocks and even pay a bit more for large bore shocks.




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