Excellent question. I do not have any historical evidence of widespread tank vs. tank ramming, and I don’t really expect that it went on. I included the rule more for sake of gameplay with non-armored vehicles (jeeps, halftracks, etc.) The rule represents a sort of last ditch option available to a player with nothing left but jeeps who is trying to face down a tank. I’ve people ask to be able to ram on a number of occasions, so I decided to come up with a rule for it. The attack itself is pretty anemic (need 6’s to hit) so I can’t think of why a tank would ever choose to ram another vehicle instead of using it’s short/medium range armor attack roll instead. Now a jeep, on the other hand, really wouldn’t have any other attack against a light tank. With the ram you might be able to damage a tank, but you are certainly going to destroy your jeep trying. Let me know if you end up using the rule and if it works for you or not.