When uncoupling a loaded trailer, what is the correct action regarding the landing gear?

When uncoupling a loaded trailer, the correct action is to lower the landing gear until it makes contact with the ground. This ensures that the weight of the trailer is properly supported. By having the landing gear fully in contact with the ground, it stabilizes the trailer and prevents it from tipping or moving after it has been uncoupled from the tractor.

Additionally, leaving the landing gear at the mid-point could result in an unstable situation where the trailer is not adequately supported, which could pose a safety risk. Raising the landing gear completely would mean it is not providing any support, which is unsafe as the trailer could shift unexpectedly. Lowering the gear and lifting it again does not provide the proper stability needed for a loaded trailer during the uncoupling process.