Damn. That was a write up. I thought about it for a while, but maybe not like you. I decided to go a cheap route. It’s not as cool looking as all those nice expensive cans but it serves my purpose of keeping some spare gas.
https://photos.app.goo.gl/GCzoPQgUx9uKsBDC7
I have a piece of angle iron attached to cross braces on the roof then the can is ratchet strapped down. It is a simple $30 Midwest can from autozone. Best to burp your gas every day.
Here is the link to the can I bought
https://www.amazon.com/Midwest-Model-5600-Gallon-Spill/dp/B0007M4VRO