With only those dings in the front, the rest being pristine, a prospective buyer should not be discouraged enough to walk away. A trailer stored inside, exceptionally clean inside, is hard to find. If buyer brings it up, be honest, as to why you did not have it repaired. I would have done the same, not wanting the front torn apart, to repair that minor damage. If the buyer asks for a discount, due to the dings, I'd explain the improvements you added, that you are not charging for, but if buyer insists, lowing price a few hundred should make them happy.
Jerry