A 3/4 - 1" screw should be more than adequate if there's actually a backer behind that sticker.
Look at any door opening, interior or exterior, to notice the wall thicknesses. The interior walls are hollow which could have wiring &/or plumbing running through them. The exterior walls are aluminum studs with styrofoam between them, shouldn't be any wiring or plumbing in them.
Don't confuse rv framing with house framing, the studs are not necessarily on any standard spacing, not 16' on center rather placed as needed.
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Full-timed 10+ years
Sold '13 Redwood FB
Traded '13 GMC Denali DRW D/A
Replacement undetermined
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