The state lines thing is only about federal crimes. Possession is most likely illegal as a state crime on its own. The repercussions of even being suspected of crimes in this area means that every rational person would take precautions far above what is legally necessary to prevent any association with such material.

Maybe use a desktop instead, because crossing state lines with that laptop might carry a jail sentence with a minimum term of 5 years.

I would assume that running an AI image generation software is something you'd do on a desktop anyway.