Used these to install a 2500 ARB awning on my FJ Cruiser.
Struggled initially with this set up (solo) until I realized I could flip the anchors around so the bolts faced outward (which I had been cursing about saying to myself, "Why don't these face the other way??!!"
Once that was done, I was able to mount it by myself.
Tip: Attach to the outside of the bottom rail with the long end pointing up... the third bracket closest to the front will be at about a 45 degree angle forward. Never figured out how to reach the second screws to get them tight, but it's plenty secure as is. The right tool, or disconnecting once locations are figured out and reconnecting would do the trick.