Ground clearance is based solely on suspension design. The only reason you'll see a lower ground clearance is if the manufacturer lowers the vehicle around the suspension, because the unibody allows tighter packaging than a ladder frame.
There were some who were complaining that the unibody is less tough off-road, but I've heard of suspension tower failure on ladder-frames used in off-road duty, also. It all depends on how well-made the vehicle actually is, rather than how it's made.
But yeah, there is an advantage off-road for ladder-frames... having the frame-rails exposed underneath everything provides protection for mechanical components tucked up under the rails... and provides a solid mounting point for skid-plates. And ladder-frames can carry some pretty heavy loads...
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The thing with the Paris-Dakar Pajeros is... they're not unibody... they're space-frame buggies.






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