I’m not sure what you think is in the core of the walls on a regular smooth side trailer, but it’s foam.
If you want a stick & tin camper you want one with the corrugated aluminum siding. Those will have wood studs 16” on center and usually rolled fiberglass insulation.
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2007/21 TM 3326 (Pride of the Fleet)
2000 2720SL (Rebuild Project)
2002 2619 (Parts TM)
SMARTER THAN GOOGLE!
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