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I would say the 137 would be more than enough. I would say if you plan on traveling in some considerable snow depth on a regular basis the 154 would be nice. Plus you will need a longer trailer to haul the 154, a 137 should fit just fine in a 10' trailer.
The Tundra LT is the same REV-XU frame as my 1200 Expedition. As you can see it fits on a 10' trailer with room to spare. I would say go with the 154…better to have and not need than need and not have. The 600ACE is nice and you'll float through the wickedest slush/deep snow. Just make sure to adjust the suspension so she steers properly, info in the manual about how to do this.
I was thinking more along the lines of an enclosed trailer, and was thinking it would be a lot longer than that. More like a Summit 154, apparently the utility sleds are stubier in the nose??