I would be especially reluctant to attach an awning
without through bolting or riveting to the shell.
Most applications I have seen or used tape or glue with are a lot less stressed than that of an awning
levered off the side of a trailer with downward weighted stress over a 10 foot long span.
Add to that what an awning that is launched from a moving trailer might do to anything or anyone it might strike and I think making 3 or 6 small holes in the trailer is a small price to pay for a lot of peace of mind?
Call me cautious but I don't understand the reasoning behind mounting one without attachments that are mostly foolproof?