We have just bought a slk 200 and are looking forward to some trips to Europe next year.
We are currently in France touring on our motorcycle...
Sounds very like my wife and I - she bought her SLK350 in 2009 when I couldn't decide whether to carry on biking or not.
Angie uses her SLK as a daily driver and most days, unless the weather's miserable, arrives home with the roof down. We have no problem packing luggage for two- or three-week tours in the car (years of practice packing bikes!) and leaving enough room for the roof to stow.
When touring we have the roof down or up depending upon the weather, where we're driving and our mood at the time. For example, in really strong sun and high temperatures it's often more comfortable to have the roof up and the aircon on. Also, if you're spending a day on the motorway then it's much more tiring with the roof down due to the increased wind noise; I've found that we also get worse fuel consumption at motorway speeds with the roof down due to the poorer aerodynamics (typically it costs around 1 - 1.5mpg). BTW, if you don't have one already, the perspex wind deflector makes a massive difference to how still the air is in the cabin at speed.
We've enjoyed touring in the SLK immensely. We've done a trip to the south of France down the Route Napoleon, a tour around Spain, another to the Dolomites and Tuscany, and we're about to embark on another tour taking in Carcassonne, the Pyrenees, Siguenza and Caceres.
FWIW, after 3 years of essentially not using the bike, in 2013 we started touring again and I really got into it again. Having both options (bike or roadster) is really great