While the general idea of a tank is as a mobile platform for fighting other tanks - there's also several advantages to a modern tank or AFV.

One can't break a window, or swarm a tank as easily, and a swarmed tank can button up and wait for assistance.

I'd prefer an AFV or IFV to a MBT - but generally you have a vehicle that's designed for rough/unimproved terrain, against an enemy who cannot effectively use anti tank weaponry or penetrate even the weakest of tank armours.

If we're talking main battle tanks, they're an odd choice. You might be able to outfit them with specific improvements for more effective zombie killing. Military vehicles do often have modifications to specific threats, like anti RPG slat armour. You might have electrified outsides for zombie zapping, spikes to make climbing up a tank dangerous, or even the use of claymores as a form of reactive armour

Effective use of an MBT might be as a 'mobile' pillbox or command unit. Move em somewhere you expect a zombie presence, lager them, with defences like concertina wire, and use their night vision equipment, height and superior firepower to clear the nearby area. You might also use lighter screening elements to herd the zombies into the most efficient fields of fire. Essentially tanks form a great core for a temporary base, as well as local firesupport.

That said, even the 75mm pop guns on the AMX 13 are hardly the right tool for the job. While anything you hit has had all its days ruined, its overkill, and you really are not going to carry more than 20-30 rounds. Tank guns are best used for effect, possibly with specific ammunition types.

Your 7.62mm or .50 cal co-axial guns might be a better option (even more so than conventional infantry 5.56mm rounds), since you don't really want to wound zombies as much as blow off meaty chunks.

The classic M113, while having armour marginally more useful than armour, with a remote weapons platform might be a perfect pillbox. Drive it over, use the .50 caliber to chew up those zombies, and scoot away to rearm, refuel and rest.

Personally, perhaps in a fit of national pride, I'd prefer something like the bionix 2 You have a lovely turret with a 30mm cannon, cause nothing says "goodnight" like a 30mm round (the same the famous GAU-8 Avenger of thunderbolt fame uses). You have two (three? I can't remember) additional 7.62 guns for lovely fields of fire

Even the adorable little weasel is going to get you much more efficient throw weight than a hummer.

If you want something with a little more flexibility, and want to not rip up the streets, a MRAP type vehicle would give you a lot of the same firepower advantages, though arn't really designed with the same sort of throw weight.

I don't really think there's any real contemporary literature on the use of indirect fire from mortars or artillery but depending on the density of the zombies, and available fields of fire these might also compliment an armoured lager/firebase well. You can carry, transport, or use armoured units that are capable of fire support for this. I'll leave the implications of responsible use of artillery and anti zombie landmines to be considered by the reader

While the general idea of a tank is as a mobile platform for fighting other tanks - there's also several advantages to a modern tank or AFV.

One can't break a window, or swarm a tank as easily, and a swarmed tank can button up and wait for assistance.

I'd prefer a smaller AFV or IFV to a MBT - but generally you have a vehicle that's designed for rough/unimproved terrain, against an enemy who cannot effectively use anti tank weaponry or penetrate even the weakest of tank armours.

If we're talking main battle tanks, they're an odd choice. You might be able to outfit them with specific improvements for more effective zombie killing. Military vehicles do often have modifications to specific threats, like anti RPG slat armour. You might have electrified outsides for zombie zapping, spikes to make climbing up a tank dangerous, or even the use of claymores as a form of reactive armour

Effective use of an MBT might be as a 'mobile' pillbox or command unit. Move em somewhere you expect a zombie presence, lager them, with defences like concertina wire, and use their night vision equipment, height and superior firepower to clear the nearby area. You might also use lighter screening elements to herd the zombies into the most efficient fields of fire. Essentially tanks form a great core for a temporary base, as well as local firesupport.

That said, even the 75mm pop guns on the AMX 13 are hardly the right tool for the job. While anything you hit has had all its days ruined, its overkill, and you really are not going to carry more than 20-30 rounds. Tank guns are best used for effect, possibly with specific ammunition types.

Your 7.62mm or .50 cal co-axial guns might be a better option (even more so than conventional infantry 5.56mm rounds), since you don't really want to wound zombies as much as blow off meaty chunks.

The classic M113, while having armour marginally more useful than cardboard, with a remote weapons platform might be a perfect pillbox. Drive it over, use the .50 caliber to chew up those zombies, and scoot away to rearm, refuel and rest.

Personally, perhaps in a fit of national pride, I'd prefer something like the bionix 2 You have a lovely turret with a 30mm cannon, cause nothing says "goodnight" like a 30mm round (the same calibre as the famous GAU-8 Avenger of thunderbolt fame uses). You have two (three? I can't remember) additional 7.62 guns for lovely fields of fire

Even the adorable little weasel is going to get you much more efficient throw weight than a hummer.

If you want something with a little more flexibility, and want to not rip up the streets, a MRAP type vehicle would give you a lot of the same firepower advantages, though aren't really designed with the same sort of throw weight.

I don't really think there's any real contemporary literature on the use of indirect fire from mortars or artillery but depending on the density of the zombies, and available fields of fire these might also compliment an armoured lager/firebase well. You can carry, transport, or use armoured units that are capable of fire support for this. I'll leave the implications of responsible use of artillery and anti zombie landmines to be considered by the reader