In the past, on my many oversea flights (passenger) earplugs solved most of the noise, but the kid kicking the back of my seat is a different matter. Once preparing to sleep overnight from Chicago to Frankfurt, after asking nice once, I just reached around the isle seat and grabbed his ankle, looked back to see saucer eyes and said "please don't do that". Mom was oblivious, but it was a quiet flight, that time anyway. Luckily, I was on the isle.
I am certainly looking forward to traveling by RV.