Screw that. All of them thar riggins hold "a shitload" until the last turd and that's when the shit hits the fan. If it is a light load, great. If not, OR, if it might not be a light load someday, applied by you or anyone after you, why bother? Attach to the supporting structure with solid, load bearing hardware. Usually cheaper and far better.

Of course, I am an engineer and we all know how daft engineers are. Or, so I am told... day in and day out by people who don't stamp, sign and date their work.