I agree with Mace1, with those profile tyres go down to around 18 and see how you go. If you are constantly getting stuck go down another 2 psi but don't go any lower for any length of time and avoid sharp turns.
My best advice other than go to a smaller rim is to carry a ratchet strap. If you do peel a tyre off the rim put the strap around the circumference of the tyre, strap tight and use your compressor to re-seat the bead while the rim is still on the vehicle.
Carrying an air jack is good for helping with this as well as it's not as dangerous if you need to use a standard or high lift jack on sand.
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Cheers,
Jamie
MY15 WK2 GC Limited 3.0L. Ironman lift, bullbar & winch. Uneek rack & sliders
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