Post apocalyptic movie with a tank?

Trying to remember a movie I saw as a child and recently remembered
parts of it. Probleuses most of what I remember is a group of people,
whom I believe were the villans, had a tank, that they terrorized
with. And one of the characters, which I THINK was played by Rutger
Hauer but I could be wrong, was somewhat "Special" in the head and his
only friend in the world was this rag doll he held on to most of the
time.

Can anyone here help?