Bill Hendershot and his wife live on his union pension and Social Security. Hendershot, a retired Consolidated Freightways long-distance truck driver, gets around now in a 12-year-old Toyota Corolla. The couple still pay a mortgage on their home in Canal Fulton. And he’s among a huge group of union retirees nationwide who could see their monthly private pension payments cut as much as 60 percent under a national reform measure signed into law in December by President Barack Obama.