Push the goal posts of you want. OP specifically said rear wheel drive.
There’s a whole community that doesn’t consider anything without front and rear lockers, dana 44 axels, frame on body, and 37s with bead lock a real off road rig.
There’s a whole community that doesn’t consider anything without front and rear lockers, dana 44 axels, frame on body, and 37s with bead lock a real off road rig.
In my mind, the biggest difference is whether front and rear drive shafts turn at exactly the same rate; if so it's "4WD". If clutch slippage or a differential allows different front and rear axle speeds then it's some form of AWD. But many AWD systems have clutches capable of effectively locking the front and rear driveshafts. E.g. the Suburban had tire-hop turning on pavement in 4WD mode which is about the most torque that drive-train would be expected to encounter.