I'm always confused by the way Auto-strut working.
For example, if I select "heaviest part", parts will be attached to the heaviest part(mostly the largest fuel tank) in factory. However, during flight, when that tank runs out, will Auto-strut attach those parts to something else, like the engines?
The "Root part" option can be very weird too. For example, what will happen if I dock two ships that both have their own root part respectively? Since two docked ships are consider as a single ship by the game, there should only be one root part. Which root parts will be consider as the new root by Auto-strut?
I raise this question is because :
1) I find Auto-strut to root part can make large ship very sturdy without any extra reinforcement.
2) When I dock two large ships that auto-strut every parts to their own root together can sometimes trigger madly wobbling and explosion. (even when SAS and RCS off)