The effect of jerries on the roof will much depend on how much load is below. In the Libyan Desert we put 30 (!) 20l jerries of diesel on the top (plus two spare tires) of HZ75 Landcruisers (which are higher and narrower than Landrovers), but with 800-1000 kgs of load below, stability is not a problem (except dune crossings, which require triple care). If you have an empty car with just two people, six full jerries on the roof may have a much more upsetting effect.
My rule of thumb is that you can put about 1/2 of the weight on the roof than what you have on the baseplate below. (Any comments on this from anyone ?)
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Happy Travels,
Andras
FJ Expeditions
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