A year or two ago, I gave a Jager biplane to a shipping company in Torrance, who knew their stuff. They packed it with a single seat Pitts into a container and sent it off to Australia. When it arrived, both aircraft had their landing gears driven up into the fuselage. They both had G-meters, both registered 6.7. Guess somebody dropped the container. Points if you calculate from what height to produce 6.7G!
That is tough to calculate because you need the distance of the deceleration or the force.
But if your landing gear on both were roughly 2' from the fuselage bottom and that 2' was used up until the fuselage spread the hit out.... G meter right near mains on both airplanes, both similar in deformation strength...
I am going to guess 2' or 61 cm deceleration distance and the container didn't put a divot in the dock so roughly 4.1 meters drop or 13.45'