That looks to me like our ZipDee awning arms, and if that's what you have, on ours, there is a bracket something like that.
It is used to store the centre support pole when the awning is rolled up and put away.
But it appears that you have two; one in the middle, and another one at an end. If that is so, and yet you do have a ZipDee awning, I would suggest that some previous installation, perhaps a bug net or room, was done at some time to your TT.
If it's to be, it's up to me.