You can be arrested for possessing a illegal firearm.
no they can't
carrying a firearm w/o a license
In most cases, self defense.
Chamber empty in a retention holster
No
You can find a complete guide on laws governing firearm in PA on psp.pa.gov/firearms-information/Pages/Carrying-Firearms-in-Pennsylvania.aspx
Indiana does not have gun registration. If you're carrying your firearm in the legal and prescribed manner, there is no requirement for it to be registered.
Depending on circumstances, everything from a fine to the death penalty
Not enough details to answer your question. If you're carrying a loaded firearm in a legal manner, and in legal possession of it, there'd be no charge.
Yes, within the limitation of the laws of the state which you're traveling in. Basically, the laws for carrying in a commercial vehicle are the same in every state as they are for carrying or transporting a firearm in a personal vehicle.
If it's done legally and in the manner directed by law, there is no penalty.