I'll assume you have the smooth Azdel side walls? You didn't say.
Most holes can be repaired just like in a boat or other hard surface.
If you have the ability to use epoxy/urethane filler and can sand and paint, most small holes can be repaired easily. If you can't do the repairs, maybe find a good body shop or boat repair place to do it.
There have even been some who simply put a decal over the hole and called it a day.
There have been other threads on this subject.
A forum search will bring them up.
Here is one such search...
Repair Hole In Side Wall
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