Of the two, Ebi is always the one meowing loudly during car trips. Even short trips to the vet he’d meow the entire way. Uni was totally silent. During the 2+ hour trip up to LA Ebi was meowing off and on the entire trip. I think there was a stretch where they both slept but it resumed later on. As annoying as it was and as worried as I was that he was super stressed out, it was kind of more comforting when he was meowing because I knew he was still there.