I think it would discolor badly. The gold is just a couple microns on top of the nickel. Any thicker and it would lose the reflective shine. As the trailer Queens you mention, so is this one. Look at the pics of the Rotors and Pedals of this one I lifted from the site Posted.
This car prolly has never started since they dyno'ed it before it was plated. The brakes certainly haven't been used, nor people allow to put their feet on the pedals. It'* jst for show to attract business.
Pretty awesome that the 4 rotor Mazda Engine Dyno'ed a whooping 1664 HP before plating. I imagine you would have to buy it to see what it will turn in a 1/4 mile.