I've ridden the TAT twice now (and in 2016 you'll most likely have the brand new route to follow, if you are getting Sam Correro's maps/tracks).
The first time I did it on a XT660Z Tenere I shipped over from the UK in 2008/09, while this past summer I rode the new route on a US registered CB500X with the Rally Raid Adventure kit fitted...
While there is a lot of distance and fast open going to ride on the TAT route, you will curse having something as physically large and heavy as a GS 800, never mind a 1200. Sure it can be done, but it won't be a lot of fun - especially if it gets muddy - while some of the more technical rocky and washed out sections you get in Utah, Nevada and Oregon will be very hard work on a big adventure bike.
People have ridden the TAT (or as much of it that they feel comfortable) on anything from a Honda CUB to a 1200GS - but I would suggest the sweet spot is something around the 650cc thumper mark - giving you enough speed and comfort for the longer open sections (there is quite a lot of tarmac initially for example), while still being manageable on the more technical and soft sand dirt sections.
Something like a KTM 690 is a great bike for the TAT (or if you're buying in the US, the DR650/KLR650/XR650L)... However, having just ridden across the country and back again on the CB500X-RR, I know which bike I'd choose ;o)
It really is the perfect all-road all-terrain travel bike in my opinion.
Jx
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