I have both of these racks and have never had any trouble mounting the rear but the front just would not fit the straight-ish fork blades on my touring bike. They are both tanks ...in a good way. I have mostly Jandd gear too. Can't say enough good things about the company.
btw my Expedition rear and Extreme front racks are available if you are interested. The rear has been used twice and the front never. PM me.