FORT KENT, Maine — The tight-knit nature of the sled dog community came through for musher Michelle Redstone when her truck and trailer crashed on icy roads about 24 miles west of Quebec City. Redstone, a 31-year-old welder from northern Ontario, her passenger Ed McEwen and Redstone’s nine sled dogs were on their way Thursday to compete in the Can-Am Crown International Sled Dog Races. A winter storm had made the roads so treacherous that authorities closed that section of the Trans-Canada Highway shortly after Redstone’s rollover accident. Redstone said she was traveling around 40 miles per hour when her truck — pulling a trailer and dog box with her team of nine sled dogs — hit an icy patch.