I don't know how much fuel a 90 can take, but with the 80l tank in my disco I never really needed jerries. They do give some peace of mind and can be handy when a certain region runs out of Diesel (like north of Benin and parts of Nigeria in my case).
There must be enough room left in the 90 for a jerrie of two. Gipper even had a 4 person garden table in it and I don't remember him having jerries on the roof.
Rob
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