Many years ago, I had a tank mounted in front of the engine similar to the way I described here because I was using a big tank on an open and didn't like how it fit our chassis under the steering column. At that time, I was told in pre-tech that the tank had to be mounted between the frame rails. Because of the unconventional design of our Vector DO chassis, the tank would overhang the main frame rails anyhow, so I was allowed to mount the tank this way. The one thing that was definitely out was to mount to the nerf bar, or ahead of the pedals for obvious reasons.