Back to tyre pressures not computer problems!
In sand driving the most important factors are driving technique, tyre outside diameter and pressure. Width is only a factor insofar as it allows you to operate at a lower pressure.
The less tread the better, but it is not a major factor.
Radial tyres are preferable but only because they allow operation at a lower pressure than crossplys before being damaged.
Tubes are better, but only because they allow you to operate at a lower pressure than tubeless - but if the pressure is so low the tyre turns on the rim you are likely to tear the valve out.
Use as low a pressure as is necessary - for a reasonably loaded Landrover this will be no lower than about 15psi depending on the sand and the driver, but you should be able to get away with about 12psi on tubes if you are careful. However, you need to remember that any speed for long on this sort of pressure will rapidly wreck your tyres, especially if they are crossply.
(above is from experience of working two years in the Simpson Desert)
John
JDNSW
1986 110 County 3.9 diesel
1970 2a 109 2.25 petrol
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