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All these things have enough power, given they have low gears, but traction is the issue. Traction is tread and weight. These are lighter units, but if you put chains on I would bet they can pull plenty.
Got to remember a Timber Wolf 250 is only 230 CC. Might pull sleds and such but nothing like a 4x8 or 8x8 house. At least not through much snow.
Until ya knock the gears right out of an underpowered one.