Just been through similar deliberation and decided not to risk the factory roof rails. Tyre and rim 30kg+ compared with 50kg total for the roof rails without any consideration for road corrugations and whatever additional bits may end up there.
I ended up buying gutter mounted roof bars (trade type) to mount the spare wheel for our forthcoming trip.
As for costs, the gutter roof bars were cheaper than the roof rails, especially if you can wait for a sale.
Regards


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