Hi all, I'm thinking about purchasing a 14 gallon marine gas caddy for sporadic use. I'd like to have additional fuel for long trips into areas that may not have serviceable stations due to power loss (ahem, storm chaser). I'm also planning on purchasing a tonneau cover to protect the caddy and other supplies within the bed of my truck from direct sunlight, debris, sparks, etc. However, I would like to know how safe of an idea is this. What's the risk of fume/pressure/heat build up under the tonneau cover? Anyone have experience with this sort of gas transport?