To: Blacksheep
The only part of the 767 landing gear that I am familiar with is the truck positioner as I did the RMS on it. I am familiar somewhat with large landing gear on large aircraft but there is one point that I do not know and that is if there is a cable grounding strap that makes contact with the ground slightly before the wheels touch. This strap grounds the static charge built up on the airframe. I do know that on the A-310 the flaps can build a charge of 1400 volts so I assume that the airframe of the 767 has a significantly higher charge. The point I am making is that this charge unless diverted must pass through the truck pivot point in order to reach the ground and this high voltage can cause electrostatic erosion or in some cases, very high temperatures.
Just a theory.