KAMIAH, Idaho - Two of America's largest oil companies want to drive mammoth truckloads of refinery equipment along a narrow ribbon of spectacular mountain road that borders national forests, wild and scenic rivers, historic sites and campgrounds. Local residents are not pleased. "This is something that weighs 600,000 pounds (272,150 kilograms), is two-thirds the length of a football field and 30 feet (9 meters) high," said Linwood Laughy, who has sued the Idaho Department of Transportation to stop the mega-loads. "I don't think it belongs on the highway."