Alaska Special got it wrong
I live in Alaska and drive long distances in moose country weekly.
I drove 600 miles today and the. Just happened to turn on the Alaska Special when I got home.
When they built the moose in the episode, Tory says that 600ish pounds is a good weight for the type of moose likely to get hit.
Unless it's a newborn, moose rarely weigh that low. Small cows weigh about 500 and large bulls can weigh 1500. If the moose I've packed and roadkill I've removed they all weigh closer to 1000 pounds.
I spent 12 hours today watching for those half-ton buggers while driving in a blinding snowstorm.