Does your state not require good lights on the trailers? I just built a new trailer last year, I was required to have full working brake and turn signals along with running lights, but I went the extra step and included more brake/turn lights on the front and rear of the fenders, along with reverse lights plus four marker lights along each side. Trailers are hard enough to see, I didn’t want to make it harder for anyone by just sticking with the bare minimum.