I also have a Thule Roof Box, and was wondering the same. I just received my Leitner rack yesterday and promptly put it together last night.I’m in the same boat with having ordered the smaller OEM rack and now worry about when or indeed IF it will arrive. I need mine to be able to take a Thule roofbox with the jaw type clamping fixation thingies!
Any idea if they would work on the Leitner rack? Seems the roof clearance may be too little. Love the low profile design but it may not fit my needs
Cheers
Unfortunately, I've found that the Thule "PowerClick Clamps" which come standard with the roof box that I have (assuming the same for yours), do not open quite wide enough to clamp onto the Leitner rack cross bars. That being said, in doing a bit of research, it looks like someone already created a potential solution (I say potential, since I haven't tested it yet), but I purchased a set of these T-track adapters, which I plan to attach directly to the T-tracks on the Leitner cross bars (there are 2 tracks on the top face of each of the Leitner cross bar):