To begin, Moses and Elijiah may be the original "evildoers" around the Crucified.
The mountain may be the Golgotha.
The Pillars may be the same sinedrites: they are both blind people, de facto.
The white garment may refer to the glory of the Cross: the same "power of God" and not a scandal or a folly.
The voice from heaven may be the cry of Jesus on the cross.
The "three shelters" may be the empty tomb of Joseph from Arimathea: they were both vain and empty. I.e. not really used for their original goal.
The cloud may be the eclipse.
And the silence of the Pillars:
As they were coming down the mountain, Jesus gave them orders not to tell anyone what they had seen until the Son of Man had risen from the dead. 10 They kept the matter to themselves, discussing what “rising from the dead” meant.
...is the same of the women at the tomb.
Jesus is talking about the his final destination: Jerusalem. What is meant is not the earthly Jerusalem, pace the stupid Pillars, but the celestial Jerusalem, Jesus being crucified (celestially) just in that moment, during the Transfiguration itself.