In order to be DOT compliant you will need some type of side view lighting on the rear. I have seen these installed and then the owner has put on side marker lamps towards the rear corners.
Take a look at any stock vehicle in the dark with the lights on, from a side view they are required to have lights the indicate the rear-limit of the vehicle.
BLESSED ARE THE PEACEMAKERS
// Trooper Trevor Casper, end of watch 4/24/15 \\
Farewell my brother