It can be done. I discovered this today and then found a few videos where others had managed it. It turns one of the toughest boss fights into a complete joke, as basically none of his attacks even damage the Wraith. At the worst all he does is just EMP you over and over again.

There appear to be multiple ways to get the Wraith over the rock barriers. My way is to drive backwards up the right path to the boss fight, because the back half of the Wraith levitates high off the ground and so can easily "climb" over obstacles. I would also recommend you don't use the Wraith in the tank run to the boss fight, nor let Osiris drive it. Just drive past it, take out the Warden in the Scorpion in the first encounter, then park the Scorpion right after the light bridge and run back for the Wraith. Don't park too far from the bridge, or it will shut off.

https://www.youtube.com/watch?v=wypk0FLTu44

Now I wish to find a way to sneak a tank into the THREE Wardens boss fight. :p