Ideal for the rough rigors of off-road towing, this fully articulating coupler pairs with a vehicle-side Lock N Roll hitch (sold separately) to form an extra-strong connection that is safe and secure, no matter the terrain. Weld-on installation.. With the latching plates secured, the Lock 'N' Roll assembly will stay firmly connected. When the trailer-side coupler and vehicle-side hitch are secured together, they form an articulating assembly with 3