@sushi2831 not that it isn't doable but IMO you wouldn't really want to do TAT on XT660z or XT600 carrying all that extra sh!t; at least second half from Lake City following gpsKevin's tracks. Maybe Sam's tracks but even then there are a few spots like parts of Alpine loop, Warlock rd in arkansas, Witt rd in TN, that effin hill about 25mi to Quinn Creek in OR, road out of Emery and Eagle canyon in Utah. Yes you can do it; yet you don't see that many full size bikes on Imogene most prefer smaller mounts. WR250r, CRF 250/300 would be a better choice, much more enjoyable.
As for riding sand it is always a possibility; just get good tires and watch for moondust or you will bite it. Personally I would take sand over mud but at least mud will eventually dry out.
And for RTW it depends where you going, I don't think you need as much bike outside of developed world, 250-500cc bike with 30-40hp and <400lbs will get you through just choose your route wisely, piece. 
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