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LeFH, Riegel
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OKW: Valiant assault (i've never been sure if it actually works)
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Sector Assault.
LeFH is actually quite decent at punishing emplacements. Well, until the Helms Deep commander drops in the game that is.
Riegel mines are also fast to place and have a 100% chance to immobilize the affected vehicle. Also, even if your engineers do spot them, they are very difficult for a player to actually spot them on the ground, due to their shape.
Valiant Assault is an amazing Volksblob enabler. That enemy tank thinks it can run away? Just press valiant assault and yolorush it with your Schrecks (make sure you have a minesweeper Sturm mixed in with your blob, though, so that you don't run over a democharge).
Sector Assault is also a very good sim-city counter.