Newmars are built by Amish craftsmen.. Our 38' Newmar stays comfortably cool/warm with only the dash A/C or dash heater running while traveling throughout the USA. Very well insulated. All the cabinets are as top quality as in any home. Very quiet and smooth ride. The 3 slides are electric and all have locking devises when closed. The 2 heat pumps keep it very warm/cool in all weather conditions with its 7' ceilings. Very seldom have to run furnace. All bays open from side to side and are heated. The large bay carries the 22.5 spare and has enough room for 3-4 more.