31-05-13, 12:24 PM
pretty sure the tank is single skined......i`ll be surprised if that slide hammer will pull the dents out ,i dont think it will be man enough....the ones i have used in the past have a self tapper on the end but does mean drilling a hole in the tank and welding up when finished but will pull the dent out........there are other more expensive types which fuse a rivit to the surface and then use the slide hammer attached to that and simply cut off when finished.....expensive and probs not worth it for the one job 
One, is never going to be enough.....