Bumpy Ride..

We are currently moving across country, from North Carolina to Washington. Due to us needing to have our car hooked up to our UHaul on a trailer, our 2 month old son has had to ride in the UHaul. UHaul "okay'd" his car seat in the middle seat & asked that we turn off the airbags. Which we have done all of the above. We seem to be hitting heavily bumpy roads & his head is bumping around. I've rolled up blankets & put on both sides of his head. He also has an insert in his car seat. These bumpy roads won't cause any brain damage, correct? It's hours of bumpy roads. The UHaul seems to make the bumps SO much worse.. 😣