No, you likely won't be able to. 100 series had a few different roof racks, but I believe all of them have to be removed to remove / install cross bar. If you can somehow slip the channel nut inside the rail and get the Rago mount attached, I think the amount of time and hassle for that will outweigh removing the rack. I took my cross bars off when I installed the Rago mount, so I can just take one side off if I need to move the Rago mount back to my 4runner. I use my own cross bars for tents, that have mounts that stay on truck permenant, so no issue with no crossbars for daily driving.
The end caps pop up pretty easy, and take care of the torx head bolts when removing, and then the whole rack should slide forward or rear to release from the captive center post.
Thanks bro, I didn’t realize the center was captive. I’m just trying to limit the amount of items I remove and then have to reseal to be sure and keep it all from leaking.
Did you touch up your Torx screws with any silicone or anything?
I have a set of Maxtrax mounted on the drivers side with the width of my cross bars is determined by them.
So I’ll just be removing enough on each end of the pass side rail to get the channel nuts into the ends and then button it all back together.