I have no clue how defend against early tanks. Paks get flanked and then they die, same with MGs.
Should I always have Grens beside my pak or MG? I can't just sit around and not cap with Grens, and I cant really move up MGs/paks up to where my Grens are advancing, as they can only be in a few select locations without being at risk. You saw how even when I had my pak so close to my base it was still very flankable by the clown car.
On closed maps like La Gleize, mines are really powerful against veichles. Ost are especially priviliged in the mines department, because they have different mines dedicated to specific purposes.
It simply cannot be overstated how amazing the Teller mine is! First and foremost they are able to one-shot light armor and severely cripple any other armor type, making it easy to finish with paks.
Another factor is that most opponents outside the top 200 are not willing to invest in sweepers before they have encountered the first mines. The teller mines will therefore lie is hiatus and freely letting unsuspecting enemy infantry trod all over them without issue. Only when the first armor rolls over will they unleash the immediate punishment, taking away any edge the opponent was hoping for and instilling an instant shock and paranoia that will most likely stay with him though the rest of the game.
I will often delay the gren lmg upgrade in favour of a few well placed tellers, knowing that this will most likely pay off in the long run. Personally I will also not put down s-mines before the first teller mine has been triggered as I don't want the opponent getting into the mind-set of looking for boobytraps before he has paid the price in a burning wreck of his initial armor.