Gary,
I do not condone loading the roof more than the 90kg odd that Land Rover recommends, but I've been in situations in the past where is was unavoidable.
80 liters of diesel fuel in 4 jerry cans, a rooftop tent, and a couple of 15kg Pelican cases had to be carried on the roof rack due to unavoidable circumstance.
Weaving around the insane number of potholes on a standard Central African road, there was hardly any noticeable roll of the 90. Certainly no more than normal.
They are very tough little wagons...

