Prevent tailgaters with this simple trick

Is a propane tank on the cargo carrier safe?

Driver was on a recent trip and noticed something peculiar about the upcoming RV.

As he approached and got closer he notices a propane tank on the back cargo carrier of the RV.

It is unknown if it was full but should we be concerned with safety here?

What happens if someone rear ends and crashes into the RV? Might be an explosive situation.

Perhaps it is a tailgater deterrent.

Perhaps it is an empty propane tank.