There is ONE advantage that I LIKE with having the wired Orange marker lights on the leading edge of the fenders.
While driving down the road..you can look back in your side view mirrors and SEE those lights when they are ON, indicating that all your other lights are
likely working as well. Even in daylight, I like to know that my directionals and brake lights are working...so I occasionally turn on my parking lights to SEE the Orange sidelights go on. It's a quick indicator that all is well, without having to pull over to see if the lights are working.
NB
PS: The biggest problem with trailer lights is an
"Intermitant Ground" connection. You have GOT to have
Clean & Bright connections ON the trailer.