Errr...no. It's very easy to throw a tread on a tank in a lot of cases. Armored APCs could easily simply be immobilized by thousands of mindless corpses pressing in on them. So what you have are high-tech, armored coffins. WWZ covers this in the defense of New Jersey - tanks aren't designed as anti-personnel weapons, ammo is finite and you literally have an enemy capable of waging 'total war; zombies are 100% dedicated, 100% of the time.
Conventional warfare simply doesn't work, because humans can't engage in total war - we need to eat, to sleep, suffer morale and other psychological issues. We feel pain and fear. Zombies know none of this. Slow and stupid they may be, but they are relentless. They don't worry about supply lines, the wounded, or resting. They give 100% all the time. They're not like living things - they're like the weather. Environmental hazards, y'know?