Every attempt to land on a tank has resulted in the tank not dying in my experience. This is however a double edged sword, as it means you can plant a hellbomb on top of them.
No no, the tanks don't enable hellbomb drops, BUT, if they happen to be near an area that does you can deploy them on top of the tank. Since the initial impact doesn't kill the tank usually.
Yeah well I tried this yesterday… it did not go well. I somehow clipped through the tank and merged inside it from my pod, the tank unharmed. I couldn’t hurt it from the inside, so I had to try and wiggle myself out. That didn’t work, so I tried calling in my support weapon on the tank in the holes that that would kill it.
It didn’t. It stuck on TOP of the tank (my teammates were laughing heartily at my situation at this point, and gleefully told me this). Finally I gave up and asked my team to kill it. It took a first hit, and I then got out somehow! And then I was immediately crushed beneath its treads.
I made sure to land well away from it the next time.