Powerful-enough telescopes to observe the Lunar Roving Vehicle from Earth?
I don't think so. In order to resolve an object one metre across (as a single pixel) at a distance of 384,400km (the diameter of the Moon's orbit), you would need a telescope mirror about 200 metres in diameter, and to achieve a resolution of 10cm (which you would probably need to form a recognisable image), you would need a telescope mirror with a 2km diameter. Currently the largest Earth based telescope has a 30-metre mirror.