For the fronts, move the whole bracket with the ball on it, up. If you look at the mounting surface in the frame, there is a horizontal opening where you can remount the bracket without drilling any new holes. One bolt will still be in a hole in the bracket, and the other one will be at the edge, where just the flange will catch the edge of the bracket. Move the ball connector all the way to the top of the slot in the bracket. For the rear, take the bottom bolt out and leave it out. Move the bracket up on the frame til there is about 1/4" slot left showing in the bracket below the bolt. The rears are pretty sensitive, and you may need to readjust it til you get it right where you want it.