Most SUVs are actually CUVs - which are cars with just bit of extra ground clearance.
SUVs are true off road vehicles with ladder chassis.
CUVs are unibody cars, mostly 2WD.
They are all just cars though, like a Ford Fiesta is!
So what does that make a Range Rover? Amongst the best off-roaders in the world, but a a unibody construction. As it the current Defender.
The 4th gen discovery was designed as a unibody, but in their wisdom LR decided to give it a chassis too. One of the reasons why it was sooo heavy.
But whether or not a 4x4 has a separate chassis has no bearing whatsoever on how competent it will be off road. That is down to things like ground clearance, axle articulation/wheel travel, traction, and approach/departure angles, ramp breakover angle, manoeuvrability etc. That last part can be the most important aspect depending on where you are off roading.
Back in 1977 when it first appeared, the unibody Lada Niva was one of the most competent off roaders available that could also be used as a normal car. While its independent front suspension did compromise its ultimate off road ability, the vast rear wheel travel afforded by the live axle on coils meant that it wasn't hampered too much. At the time, the Series 3 Landrovers had leaf springs front and rear, limiting the suspension travel and also restricting the steering lock (a lwb Landy needed a ludicrous amount of space to do a u turn!).
The original Fiat Panda 4x4 (also unibody) was and still is hugely competent off road, despite its fairly primitive 4x4 system and lack of a low ration transmission. Simply because of its lightness ground clearance and manoeuvrability.
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