As long as the TM is closed, I think you are good - it is pretty sturdy. If it is open, I might be concerned, though I have no hard info. I doubt that you could accumulate more than a couple hundred pounds of ice, which isn't much.
A more dangerous situation would be a lot of snow, followed by a lot of cold rain. The rain soaks into the snow like a sponge instead of running off, and it is pretty heavy. This is what collapses house roofs in Maine on occasion, though I suspect that a closed TM is a lot stronger than some of the flat roofs in rural Maine. The solution,of course, is to brush the snow off the roof before the rain starts. The same ought to apply when ice is coming - if there is a lot of snow, brush it off the roof before the rain/ice arrives. You don't have to do a perfect job - just push most of it off with a push-broom or even a leaf-blower. Or throw a tarp over the roof before the snow starts, then pull the tarp off the roof to clean it.
Of course, you have drained the water system, right?
Bottom line, I don't think you are in any danger.
Bill
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