Is it safe?


Not sure where to post this. I have a 4Runner so I am going to post here. I have a steel Jerry can that I am going to mount on my roof rack. That being said should I worry about the can being exposed to summer sun? ( Michigan summer time 90+ deg F ) I will at times be exposed for 1-4 hours while driving and 1-2 hrs standing still. Never seen or read of any concerns. Should I worry? If so what about the peeps in the desert who have this set-up?
Thanks for your replys!!