The locks in the Grenadier are not there to be inserted when you are stuck. This is done before entering such a section. It is good to know what to expect. Then you can decide whether it can work only with the middle, the rear or all three. In my Grenadier, the locks lock into place. This works even when driving very slowly, because there are always certain steering movements. And don't be constantly distracted by the LEDs and error messages in the car. It all works when you use your brain. Most people will never need the use of three locks. The Grenadier is built so that even with just the center differential locked, they can get through almost anywhere with some momentum. Everything else actually needs some preparation as well (trail walking). No lock in the world will help you more if you get stuck in a deep mud hole. The momentum before, however, would probably have helped one. And that even without front and rear lock. These are really only for extreme situations such as very steep very long and very slippery passages. Everything else in Central Europe creates the middle lock. That's my opinion.
