i have a couple of budies hear in town that love to drop there cars on its nuts.iv seen them rolling there fenders befor but its kind of wierd how thay do it! thay jack the car up with a wind up jack leave the wheels on then take a wooden bat and slowly lower the car till the bats bearly touching just the inside lip. holding the bat at an angle thay roll it back and forth. once its not doing anything thay lower it some more and reapet untill there happy with it. i would imagen its the type of thing you have to have a feel for. iv never done it my self. but it allways looks good when thay do it to there cars.