I don't think this is possible. Our Thule brackets are permanently attached with blind insert nuts and sikaflex.
The awning case is secured to the bracket with 4 screws so the case could potentially be unscrewed then lifted off, leaving the two brackets on the van.
Don't think I'd fancy lifting it off mind, took two lads to lift and position the thing.
Can I ask, why would you remove the
awning?