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I used a dog sled for years an I'm glad I was young. We renamed them drag sleds, they pack off and fill full of slush and snow and end up weighing twice their actual weight by the time you get to your spot. The otter with the cover is the best I have ever used.
I fish with an Otter Sled. I have and still do run 40 to 50 MPH if I have to. They will take it and I dont worry about my stuff falling out with the Otter cover over the top. The only thing they dont like is hitting a tree on a cold (-20) morning. They will break. Other than the Otter I have yet to find anything that will out work these. Also if you have to skim open water they float and you can keep right on skimming. Good luck in your search.