According to the manuals, the maximum roof weight for any Land Rover is 75kg.
Having said that however, I've seen plenty of Land Rovers with a couple of wheels, jerry cans, water tanks, etc up on the roof, weighing well over 75kg, so it seems to be a bit flexible 

 And also bearing in mind of course that this is the maximum load while moving - if the weight on the roof (including the rack itself) exceed 75 kg's, the stability of the vehicle will be adversely affected... that's not to say that it can't handle masses more weight when parked though....
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