I know the book shows a tab bent over for the tank straps with a bolt through to the chassis but as soon as you tighten the thing up the tap will straighten out and not really tighten the tank down. If the method used on commercials was used it would be dead simple to re tighten at any time because you would only need to tighten the nuts from under the car. You would only need to weld the studding straight to the strap and there would be no tab trying to pull out straight. just thoughts
Bob