In Gurps, how powerful do you need to fight a tank?

[Anthony]

Originally Posted by Varyon

With Flight or increased SM (possibly via Stretching), I think you could potentially get away with the ability to lift half the tank's weight, as it's still resting on one track while you're lifting it. A two-handed overhead lift (taking four seconds) lets you lift up to 8xBL, so you'd only need BL equal to 1/16th the tank's weight

Sure. That's about ST 200 (BL 8,000 lb or 4 tons, enough for a 64 ton tank)

Originally Posted by whswhs

I gave Stalina Super-Strength 13 on top of ST 20. So she had 33/320.

Which should be plenty, that's a BL of a hair over 10 tons. It's not enough to punch through frontal armor, but it's sufficient to flip the tank, pull the turret off, and so on.

Tanks are not generally very good anti-super weapons, because supers tend to have very high mobility. I would expect army tactics against supers to just use small arms against supers that aren't immune (if you have a bunch of guys shooting ARs at you, even super-dodgy characters are gonna get hit), missiles against the more durable targets.