I was worried on the drive home because the roads were a little bumpy and I could see the table bounce up and down and I thought that something might get loose. I will take your suggestion and look at the wires of the tonearm.
Rangefinder (Threads | Answers | This Thread)
When transporting a turntable, the platter needs to be removed so the bearings don't get damaged. I'm sure this wouldn't have caused the problem your having though. I mentioned it so anyone reading this doesn't transport one around and damage theirs. It would cause a low frequency rumble sound through the speakers if they get damaged.