For a one step polishing job on a 7x16 white enclosed trailer with moderate to heavy scuffs and scratches on one side? This particular trailer also has the painted roof edges that are in need of the most attention. The condition of the paint is very good minus the damage mentioned earlier. I basically plan on hitting the whole trailer with D151 and a purple foamed wool pad and polishing the fenders above the tandem axle wheels. They are the very skinny fenders that have the wheels inboard of the trailer. Just a rough guesstimate regarding pricing is what I'm looking for... thanks!