My friend has a koala camper with adzel outer wall construction. Looks nice and holds up well. its supposed to be immune to water absorption and mold. from the net:
· 50% lighter than wood
· Offers 3x the insulation value of wood
· Odorless, Formaldehyde free
· Sound and energy absorbing
· Impact and puncture resistant to help prevent damage
· Impervious to water: Unlike wood it will not rot, mold, or delaminate sidewalls causing costly damage
2017 Grand Design Reflection 303RLS towed by a 2016 GMC 2500HD gas with Andersen hitch and B&W turnover ball mount.