The WD21 was a body on frame, and it was used for the Pathfinder and the Hardbody Truck(D21) The R50 was a unibody and there was no comparable truck (duh, it wasn't body on frame), but it was used for the Pathfinder and the Infiniti Qx4 (JR50) Meanwhile, the New truck, frontier (D22) now started sha...