Probably the main thing would be if they hit the power lines and cause power surges or something like that.

electrical more than vibrational - but you can set the computer on a cushion of some sort as long as it isn't going to cause any kind of overheating or anything..

hard drives are pretty tough - I think if they are dropped or if a magnet is placed near them are the big issues.

but your HD is new so if it is really bad you can turn the whole computer off and it will "park the heads" - that's what I read years ago so I don't know if it is even necessary anymore.

Just think about all the abuse laptops take in cars , on those roller totes on rough ground, on and off desks etc.

that's the gist of what I skimmed on a quick search about hd & vibration/damage