We are going on our first family trip to Maine to visit hubbys grandma next month. It's going to be…

We are going on our first family trip to Maine to visit hubbys grandma next month. It's going to be a 9 hour drive 🙄🙄🙄 I really need to find one of those bathtub seats so I don't have to pack her big clunky bathtub & can just use the seat when I want to bathe her before bed. Anyone know where I can find one?