... steel sheet as outside cover, plywood as inside cover, with EPS foam in core. Common panel thickness 30mm,40mm,Model C: Aluminum ... as outside cover, galvanized steel sheet as inside cover,with EPS foam and/or plywood in core. Common panel thickness 30mm,40mm ... : Aluminum sheet as outside cover, plywood as inside cover, with EPS foam in core.Common panel thickness 30mm,40mm,Our refrigerated truck ...