So in the end, they emailed me saying they have to reschedule and they needed to be with family. I asked for my deposit back and they said it was no problem and to just call the shop and ask for it. I think your right atomicmagpye, the tattoo gods are telling me something lol. Luckily I got in with another artist, I was planning to go to anyways, on friday to get the same subject in a different style.
See video for what happens when someone tattoos you in an RV - or in this case a car.
It's the acceleration, corners and braking that usually cause the issues.
It may be possible on a long stretch of highway - but still not usually recommended.
skip to 35 seconds in for the educational bit.