In the tank-based battle of Kursk, Russian commandos used to hitch a ride on the back of enemy tanks, because they knew that the grmans would not shoot at their own tanks, but it allowed the commandos to get among enemy vehicles easily.
When dealing with Wraith tanks, jump on the tank, and it won't be able to shoot you. Surrounding enemies will shoot at you, but make sure they miss, and hit the tank instead.
When it's very damaged, chuck a plasma 'nade on the thing, and run off the back. Simple!