This article that you might want to consider shipping your clothes if you’re planning on staying for more than a few days.. They say it will give you more room in the car.. Personally, I think that is kind of odd. You can always take a reasonable amount of clothes and wash them.
However, you will want to be sure to take any medications that your special needs child may need.. Take the therapies that they are going to need to take day by day as well as the ones that they may need just in case.
Let your child take a couple of toys that they can play with in the car. You will also want to take things that you and your family will want to listen to together.