Gas can mount on top of spare tire on back wall of trailer

As I was driving to a welcome to the new year and new regulations meeting yesterday and following a tanker truck I couldn't help but think of this thread and how happy I was that I did not see your small gas can in front of me:):):):):).

In the meeting they discussed portable fuel containers and one item was to start phasing out portable metal fuel containers. The thought process is a metal fuel can may cause sparks when it bounces on the road surface whereas a plastic container would not cause sparks.