But, I would have a personel carrier by now, also some portable generators, even some solar panels!
The problem with snatching an APC is that they guzzle gas. Gas goes bad fairly quickly; realistically, by now, gas supplies are going to start being bad. So having an APC would just lead to more gas scrounging problems. Of course, no post apocalyptic fiction I've seen seems to take that into account, and Walking Dead probably won't, either.
Still, taking a gas guzzler that no one has experience working on mechanically is probably not a great idea. When it breaks down, how are they going to fix it? The Winnebago is bad enough, but at least Dale seems to know it inside out. I assume that's the reason they keep the other cars, too -- they know them.
Also, I wonder how useful it would be to keep to older cars? They would be more worn, but they don't have the electronics to fix a new car's computerized system if something goes wrong. Might be why they keep the jeep rather than grab a new SUV.
I assume they did crush undead with tanks -- until the military ran out of gas, and those Abrams became forts rather than vehicles. Of course, rolling over the zombies wouldn't necessarily kill 'em, unless you popped the head. Rick's first zombie -- the half-woman in the park -- is evidence of that.
I don't know if these Walking Dead freeze or otherwise behave like World War Z's zombies, either.
What they need is close-fitting (so it isn't easy to grab) bite-proof armor. They don't need to stop shark bites, just zombie bites; extra weight would be bad, because it means you can't run away from an unexpected horde.
Of course, traditional zombies are really pretty easy to kill, until something goes wrong. And in a zombie tale, something
always goes wrong.