Well I can remember covering 800 miles in two days very comfortably on a mate's RD400 back when it was the latest and greatest Yamaha stroker.
Oh, and the mate was on the trip too, same bike. We took turns steering and pillioning. No trouble at all cruising at up to 80mph, IIRC.
Today? Wouldn't consider it on one of those, even solo. But then, I don't ride an MZ.
For a proper tourer, I too like the sound of the T/GT500. Probably more reliable also.
Sorting out the S4Rs Ohlins shock: click here