I saw a cool way to mount an optima battery. The guy was running dual optima batteries in his scout. He had converted it over to a v8 and dovetailed the fron so that there was no room under the hood. His solution was to mount them upside down under the bed. Because they had the round cells he was able to drill holes on the edges between the cells and bolt then to the undersie of the bed. Sounds sketchy but it looked way legit. They werent goin anywhere. You could do the same thing in the engine compartment though. Bolt the battery to the fender. I think it would hold better than the stock battery mount. They sometimes come loose.