Why are ROVs usually 6 or 8 wheeled, but manned crafts are only 4?
No more than watched a program on the soviet lunar rover, and realize that most space rovers and in manned robots (bomb disposal, Chernobyl sing up, etc) are mostly six wheeled sometimes eight. But that most manned vehicles that aren't treaded have 4 wheels.
Why?
I don;t identify for sure, but I would guess that it has something to do with the likelyhood of 'grounding out' whereby the vehicle drives over a lump in the terrain which makes get hold of with the area of the chassis between the two wheels, thus immobilising the vehicle.
By having more wheels, the wheelbase (per adjacent wheels) is smaller, so over any remonstrate over the chassis's ride height is increased, decreasing the chances of grounding out.
I guess it is assumed that manned vehicles will not be driven over such obsticles in the same way, as the driver has a greater meadow of view (compared to, say, the camera feed of an ROV), actually being there in person, so will find it much easier to make a judgement as to whether or not they sould tour where they want to go. Also, even if they do get stuck on something, there is a chance that they can use their human intelligence and capabilities to free it.
By having more wheels, the wheelbase (per adjacent wheels) is smaller, so over any complain about the chassis's ride height is increased, decreasing the chances of grounding out.
I guess it is assumed that manned vehicles will not be driven over such obsticles in the same way, as the driver has a greater hockey of view (compared to, say, the camera feed of an ROV), actually being there in person, so will find it much easier to make a judgement as to whether or not they sould constrain where they want to go. Also, even if they do get stuck on something, there is a chance that they can use their human intelligence and capabilities to free it.
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