An interesting topic - I myself have encountered the transportation of cars between the states and I understand how important it is to think everything through. Especially if the road is long and you plan to stop at lakes, rivers or the coast. For example, we combined a road trip with active recreation, so we took care of safety on the water in advance. Foam life jackets https://gaelixmarineservice.com/safety/foam-lifejackets/, which we found here, came in very handy. They are lightweight, do not restrict movement and are certified - this is especially important for a family with children. So if there is a chance that you will be near water - do not spare time for preparation, this will increase the level of comfort and, most importantly, your safety.