There are other threads in here about the TDM; in fact years ago, the XT600 forum was altered, i.e. enlarged, to take account of the fact that Yamaha do manufacture a range of bikes, including that popular single cyl
As for the Versys, Kawa are probably being very cautious about their luggage carrying capability; I would expect that luggage manufacturers, other than OEM kit, would supply a top box and panniers arrangement, so long as you don't exceed the stated all up weight limit for the bike.
In the discussion about this bike, I was interested in it's two-up capability.
I am not sure where that thread is; it could be under the "which bike" forum rather than the "Kawa tech".
It may also be listed as a KLE650 topic/heading?


Agreed, for a single rider with or without luggage it has done a fine job for me also - there is a 7 year old F650GS twin spark in my garage.
The longest single day ride I have done on that bike is about 560 miles in one hit along the 2/3 lane motorways.
It is certainly a very smooth single cyl bike compared with many other singles - there are lots of earlier threads in the HUBB about this bike, stand alone or in comparison with other bikes of similar specification.

I have always shied away from this after experimenting with such a load - it is just personal choice; I agree it can be done, but the passenger may not have the best experience overall.
Maybe it was just the way I ride, but the passenger was constantly banging the front of their helmet against the back of mine!!
Again, this has been discussed elsewhere, so it is a case of whatever floats your particular boat.
I have taken the F650GS around a lot of the Alps and I would not want to have a lot of luggage and a pillion on the bike on such rides; again, just personal choice.

__________________
Dave