I found studs in mine. Look for little dots in the wall panel where they covered nail holes with a color- matched putty. Usually 2x2 studs so don't use long screws or you'll go out through the outside panel.
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Brian and his Girl Crew
5 bikes - one top tube
Rig: 2004 Excursion 6.0 PSD + 2009 Salem 27' TT