Welcome to the Forum.
A difficult question to answer as sand can vary from hard packed to soft and powdery.
However, a good starting point and general rule is to use low range, about 18 to 20 psi and avoid spinning wheels. Take off slowly and build up to desired speed as quickly as possible without wheelspin and don't turn sharply.
Regarding tyres, a large diameter, relatively smooth tyre with rounded shoulders is best and will reduce the tendancy to dig in.
If you do happen to get bogged, don't bury yourself to the chassis rails/diffs but instead, stop early and try reversing slowly over your tracks, maybe after letting tyres down an extra couple of psi.
Don't forget the shovel and don't be afraid to use it to reduce the grade infront of the wheels when debogging.
Good luck and enjoy your experience.


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