Try http://en.wikipedia.org/wiki/Dogsled_racing
Has lot's of links perhaps you will get lucky. But from the quick read I did the weight may depend on the number of Dog's.
Hope This Helps.
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I have a husky and sled with him a lot, and he doesn't like to run for TOO long, but he really likes to get out and go. My advice is not to push your dogs to far, but to try and go longer each run by just a little bit.
It depends on how they are feeling that day or how fast the sled rider wants them to go with a few commands.