Like Hltoppr said most of those racks are only for the smaller dirt bikes. My KTM and the GS for sure would not be good to carry back there. I have a truck, so I don't need a hitch mount, but it's really scary to get it in/out even with 2 people. It'll only be worse if/when I lift my truck. Because of that I'm leaning towards a trailer. It's not often that I would have to trailer it, but I'd feel much safer getting it in/out by myself. I've been looking at this trailer and this trailer. Kendon is more, but it folds up out of the way. Also, you can get a cheap fold up kit from Harbor Freight here but I've read that you need to repack the bearings and I don't know if you could fit larger wheels/tires.
Errin
'07 Chevy Silverado
'07 KTM 990 Adventure
Salsa Fargo Ti
Salsa Mukluk