The walls were upgraded with layers of insulation and an air gap in order to help the van retain warmth or coolness in various seasons, and the air ducting was run through the ceiling and floor, giving the van heated or cooled floors when temperatures are excessive in either direction. The ceiling was also equipped with a full “internal roof-rack”, which is essentially a modular tie-down system to hang skis, netting clothing, or anything else you can think of out of the way.