A set of tyre deflators makes it so easy when deflating for a trail or soft sand. Just remove the valve cap and screw on the deflators that you have preset to your required pressure. Once you have fitted all four, the first one will already be deflated and can be removed. Walk around the vehicle removing the others whilst watching your colleagues trying to deflate with a stick and gauge.
I use two different preset pressures one for soft sand, and another for general trails, which I've marked on the deflators. My deflators are preset on 1,6 bar and 1,0 bar respectively.
Presetting can be a tedious job but the ease of use on a hot Kalahari afternoon will be well worth it. (Buy from us, and we will preset for you). The deflators are small and can be kept in your tyre repair kit box.