Pretty sure 2" is the limit before you need a low volume cert. I do stand to be corrected on this. I'm having a 2" kit fitted this month on my 2015 Hilux using Dobinson coils with Raw shocks all round, rear springs are having new mains made and rest of leaves reset to balance out the front. All done by a spring maker mate that does them through his business, based on past experience. Not increasing rear load as I don't carry heavy loads when off road, so sticking to the 0-300kg payload.
I'm not increasing the tyre width but going up in profile from 60 to 65 for a bit more tyre wall. Mine has 18" factory alloys.
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