The first problem is it has to be 25 years old or older or else it's a class III weapon (regardless of it being a jeep or whatever). Even if it is 25 years old or older it has to be "de-milled" (demilitarized) so that you can't, you know, overthrow Boise.
The second problem is that you need a commercial driver's license for anything over 13 tons... assuming it's street legal, and you can get it on the road.
The third problem is you're talking about a multi-ton military vehicle 25 years old or older that's probably an ocean away, and that gets spendy not just to acquire but also to maintain. Tanks have tread life of, like, 100 miles on pavement and it's not like you can go to Autozone for replacements.
Much as I'd love, say, a BTR-60, the fact of the matter is it's a dual-engined eight-wheeled Soviet vehicle from the '60s that weighs 23,000 lbs. That's pretty much this
Built back when this was new
As programmed by this guy
So if you want it, you better want it.
The ones you see most often are Diamler Ferrets,
Which tend to be in the $20ks.
And they still aren't particularly practical. They're about the size of a full-size van and they fit three cramped people in weird places and are british.
130hp, 8,000 lbs, Lucas Electrics and a Rolls Royce inline 6.
And no turn signals.