You can make all the connections but the opposite side turn signal behind the light. The opp. side has to be tapped at the other light, or elsewhere in the harness. The harness to the rear exits the interior of the truck under the back seat and follows the pside frame rail to the pside rear, then goes across the underside of the truck to the dside corner. Making the taps inside the body cavity protects the taps from weather, and it's easy to seal up the wire holes.

Not responsible for advice not taken...