I would like the same info as Jupiter , I have a new 2015 GS 1200 Adventure that I want to keep as is , but based on your price for a complete rig I may sell one or two of my other bikes to get the right bike for your sidecar.
I have owned a Ural and the sidecar is fantastic but highway speed is a problem , I want to cruise at 120km/h but have a bike and sidecar that is safe and stable enough to overtake at say a max of 150 Km/h.
I like long distance touring but my job does not allow me to be away to long. With this in mind one of my favourite destinations is Namibia . I need a rig that I can do JHB to Uppington in one day on tar to allow me more time to travel and explore on dirt at a sedate speed.
I am watching this thread with interest and have buyers for two of my bikes.
These sidecars is comfi between 120 - 130. Everything over that is an effort. You will not be able to do long distances at a speed more than 130km/h, unless you super human. Short burst at between 140-150km\h is possible but then you have to hold on for dear life. I have reached 163km\h true speed (GPS) once, but you can hear and feel the bike battling. My prefered speed is 125km\h. The bike just feels happy at this speed.
But as 2bfree mentioned, they ride like a dream on gravel roads. I have been to Nam with mine and we encountered some horrible sandy roads. It was no problem for the rig, you just keep your cruising speed by slightly adjusting the throttle input.
I have found that I can travel further distances on gravel in a day with the rig (loaded) than with the bike, pillion and luggage. But once again, I found that traveling on gravel between 80-100km\h was the best. At this speed you can cruise all day long and enjoy the scenery and wildlife. Yes, and you can also drink a cuppa (or something cold) at this speed. You must just have a trained monkey. I am a smoker, and at times I smoke on the go.