I don't want to butt in on the tank argument, I go both ways. Kinda like the photon physics situation where light can be described as a wave, or a particle.
Can:Leverage. With leverage, a spartan can only use half the strengh needed and the pivot(turret) would also help.
Cant: Lets see. A .5 ton spartan that with bio enhancments and armor could probably lift around 10 tons? Maybe more or less? Not nearly near a 66 ton scorpian.

Obey the Law. The only Law