I like the method of oil on the floor with a separate sheet of aluminum under each main and rolling the a/c fwd/aft observing sheet displacement relative to the floor! The attitude of the a/c in landing and under load can change directional control substantially. An extreme hard landing could at slow enough speed and depending on the geometry of the landing gear cause the a/c to loose directional control. FAA landing gear drop tests require 4 g's at 1 foot drop w/o deformation (something like that anyway) Most kr's have shallow T.O. and LDNG angle and are slightly over 1 g vert deceleration.
? guentheraviator at yahoo.com
