system
A chat on subreddit /r/pcmasterrace
human
I removed the GPU before the drive. You are definitely right though. Flat is better.
gpt
Yea that works too. 

I don't think the orientation of the PC matter much once the GPU is removed. Laying it flat is just to prevent the GPU from damaging the PCIE slot due the bumps on the the road. 

Anyways safe driving and i hope everything goes smoothly for you during moving day. (: