I wanna make a tank that follows script_vectors around my map and it doesn't stop moving ever. i also don't wanna be able to ride the tank, just have it be an obstacle

You can check the payload map and gsc and make their movable tractor script work for you. Of course you will have to change a lot of the script (since it doesn't do exactly what you want) but it will give you a good idea on how to do it and set it up in your map! Hope that helps out some 

Try this
https://www.mediafire.com/download/ngrqjbdk8pnvbyj

Instructions at the top of the gsc. prefab included. Look in the prefab before unstamping so u can see how they are connected. Its possible the connections will break when it gets unstamped.
Speed and lookahead kvp can be adjusted.