I have the same marks, my assessment is that the counter edge is slightly vibrating against the wall while on the road. It has abraded the clear coat in that area and allowed Filiform corrosion to begin.
I applied this: https://smile.amazon.com/gp/product/...?ie=UTF8&psc=1
Along the edge of the counter with an eye dropper and wiped off the excess. This will arrest the corrosion that has begun and provide some lubrication qualities to prevent it from getting worse.
As with any product you are unfamiliar with, apply Corrosion X in an inconspicuous area to see the results or if it has any undesirable effects. Then apply to the effected area in a very small spot to start with so you may evaluate the results of the treatment.
Hopefully others will chime in with some other ideas or better news.