Two tall ladders positioned on either side of the cab so I can insert 2x6s just above the hood to make a scaffold. Tie the planks securely to the ladders. Then vewy vewy carefuwwy do the Elmer Fudd scoot to the center. This is where my electric buffer is handy so I don't have to move too much. Oh and Herself is the official ladder holder when I climb up one of them. With RVs I've always found it helps to have two tall ladders after all the second can be stored on top of the first one in the garage.