This something for me . In November we where in Morocco , than we made some dunes trips . Other people give me some advise, when we go alone to Merzouga dune I made 1.8 bar , when we meet French , first what they told is to go down to 1.2 bar (245/75/17 BFG A/T tubeless). Next advise I didn't know if I should run on 4L or 4H , they told for our type of driving we need speed to pass dunes so 4H. Some days later we come to erg Chigaga with another French , we where to long on dunes and we get some problems with his LR . Later I have problem I got stuck than with to much spin I got overheating gearbox , we stay 30 minutes, some stress I got stuck second time . I made pressure down to 1 bar and I drive out . After this I think when you can't make speed enough, is maybe better go for 4L. I think in small areas this tactic can be better . Next day we drove 30 km in the sand but with speed , I made 1,8 bar, because first idea was to go near mountains on stone piste. When we change plan I should made pressure 1.2 then car will drive perfect with 1.8 he drove only because of another big plus which I have , 4.0 l 6V petrol. I always use D
Regards Marek