The curtains actually get a lot of questions. So I cut the blackout curtains to size, folded the top over stretch cord which runs end to end and sewed it in like that. Then I added hooks like this in a few spots along the tops of the windows:

https://www.amazon.com/Hillman-122316-Multicolor-Utility-Picture/dp/B000C14XS2/ref=asc_df_B000C14XS2/?tag=hyprod-20&linkCode=df0&hvadid=168489986144&hvpos=&hvnetw=g&hvrand=3743226517882495767&hvpone=&hvptwo=&hvqmt=&hvdev=c&hvdvcmdl=&hvlocint=&hvlocphy=9033604&hvtargid=pla-306490447111&psc=1

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I drilled out the holes in the hooks and used the bolts in the windows in the Leer to mount them, 4 placed per window. I actually bent the hooks upwards so they're straight and pointing upwards. I then cut the stitching that I added in the curtain in a few spots to match up with the hooks, so that the stretch cord can pull out and hook over the hooks. Added small pieces of velcro in the bottom corners of the curtains to keep them taught, the velcro sticks well to the headliner in the Leer. I feel like I'm not explaining it very well but I hope that makes sense. It takes some time to get it set up properly - figuring out the hook placement, etc., but once its set up they're easy to deal with. I can get pics if you'd like but won't be back with my truck until the end of the month.