How to kill uber Axis tanks?

[Herr Straße Laufer]

I have a different view of armor facing but, this is about taking out that Panther or Tiger.
I agree with Huib that Tigers are a bit more brittle than their reputation would make it seem.

In the example you gave I would take pot shots at range from Allied AT guns. Then I would move infantry forward to prepare for assault. I would then take two or three tank platoons together to fire in volley. If nothing done disrupts the Panther, I would then move all my armor away or to out of sight positions to try again.
If I had a couple of turns to prepare I would lay smoke to one side of the Panther and maneuver some armor closer.
The closer allied armor can get to the Panther the better your chance of hurting it.
Once disrupted it still has a great chance of hurting any allied tanks rushing in for the kill. Prepare for losses but, do your best to keep them to a minimum. Unless time is of the essence and the scenarios allows for the extra losses.

Ed