I have a plastic boat fuel tank. It has been on my ladder for several years. I had the typical plastic fuel cans for several years before the boat fuel tank. The Boat fuel tank is much thicker than the plastic cans, and has more rubbing in its design. Both types of containers puff up when they get hot, but so do my metal gas cans. They have been exposed to over 110 degrees, and in full sun. My bet the temp hitting the containers was much hotter than the 110 degrees. Never a problem.
One of the several reasons I went to the boat fuel tank, is because the boating industry has pretty strong safety rules. I don't think the plastic tanks would be allowed if they were not safe.
