I mounted mine on the passenger side fender well. There is a flat enough spot for three of the mounts and had to make a spacer for the fourth. I bolted the tank under the body right below the back seat. I drilled a hole in the tub above the brake light for one air chuck, and another sticking out of my winch plate. Fairly happy with it so far (mine's the 450), just have to be a little patient while airing up. Get an air chuck that clamps onto the tire valve if it didn't come with one, not much fun bent down in the snow airing up tires for 15 minutes.