Wonder what is the best way to transport gas in the truck into the back country. I have plastic gas cans but they seem to splash out or leak fumes a little, just enough to be annoying. I just want to have 5 gallons on hand for “just in case”. Looking for something that won’t leak fumes or seep out. I might be sleeping a few nights under the topper. Just curious to see what some of you are running with. Thanks