Restoring an American Classic: Interior Insulation

This is a camper. It will be used camping. There is no expectation of maintaining a perfectly comfortable 75 degrees inside. But we do have a heater and an air conditioner. So, a thin one inch layer of fiberglass and foam insulation was installed between the outer and interior walls. The insulation helps with temperature control, and it also reduces noise transmission and provides lightweight mass to the hollow, thin walls.