Okay, no tracks on the roof. Then why do you care about the factory racks?
How wide is your awning?
Do you need to have roof racks for other purposes, other than the awning?
If not, I would provision two or more mounting brackets for a low cost solution. You might be able to find brackets already made for a ladder rack application.
The only downside is that they would be fixed in place when you're not using the awning. That's where a rail and removable foot has its advantage.
You'll have to share more about your requirements.