Hi Oz
Never used T63s but I've got through a fair number of MT21s and tbh I would have thought you'd struggle to get from Gib to Tim and back on one - particularly on a loaded 650R and spending a lot of time off road.
Both of my trips down there have been using Mich Deserts and I reckon to get about twice the mileage out of a Desert compared to an MT21. A Desert rear would probably be ok for that distance but I'd also be concerned about the front. On my last trip it wore out well before the rear - the extra weight stressed it more under braking.
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