In a perfect world, we all would be able to own a tank just for fun. But tanks are not legal to own and too big. If you are looking for a small tank for your projects, you should give the Badger a look. It is made by Howe & Howe Tech and weighs about 3000. The Badger is strong enough to breach buildings.
The Badger is 32″ wide, so it can go through a door. Its armor plating can repel large caliber rounds. The above videos show what the Badger is capable of.