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I have recently fitted my 2008 Toyota Hilux Twin Cab Ute SR5 (KUN 25R) with Goodyear Wrangler AT/SA tyres size 31x10.5x15. Can you please advise me on tyre pressures for two scenarios.
ONE --- Most of the time there is only one driver and one passenger with no more than 100 kg of survey and soil testing gear in the back. Can you recommend the best tyre pressures, front and back, for this running. We are looking for the most comfortable ride over mostly sealed roads with occasional running onto building sites.
TWO--- Only a couple of times a year we are loaded up (300kg in the back ) + 3 persons and tow a heavy trailer (1000kg), can you please advise what we tyre pressures we should have front and back for these trips.
I check tyres regularly so changing pressures is no problem. I generally get 70,000 to 80,000 km from my tyres.

Under normal driving condition you can inflate all the tyres to 30psi but under load inflate the rear tyres by 4psi.

Remember to always stay within the tyre and vehicle manufacturer specifications.