Scab
I got nothin' here...
Well, being from Alabama, I will tell you. While here, you will have no problems when you have just the paperwork. As for the other states, I think it would take a real a-hole cop to ticket you under the circumstances. I really don't see that happening. The one thing that I would worry about is remembering to carry proof of insurance. Alabama won't arrest you but what about the other states? I know you will be going the other direction, but as example, Georgia will take you directly to jail without proof of insurance. I purchased my bike in Georgia and they wouldn't even let me leave until my insurance company sent proof that the new bike was covered. (and I was going to haul it home in my truck) Since the lack of a tag may get the leo's attention and get you stopped, I would make sure I cover as many bases as possible. I really think the lack of proof of insurance will get you in trouble quicker than the lack of a tag.