I got this driving a rental RV around South NZ where like half the traffic population is rental RVs.
Eventually it was more fun imagining their thought process is just like that of an excited dog...
"Hey! Oh my god, hey! We're both in rental RVs! Hey! Hey! Hey! Aw, he didn't wave back. That's fine, that was so neat...............Oh, hey! Hey! Another rental RV like me! Hey! Oh my god they waved! Sweeeeeet! What a swell holiday!"