Earlier this year I had some rock chip protection applied to the front of my 17A. In order to save a bit of $$ and to expediate the process, I decided to go with black line-x on the front corners of my Escape.
While it looks ok (by me) and works well to prevent rock chips, I would recommend getting a lighter colour than black.
In the sun the black definitely heats up - enough that there is a very notice-able warm spot on the inside of the trailer (with a distinct enough transition to tell exactly where the black ends on the outside by putting your hand on the inside).
The moral of the story - get a lighter colour if you can.