fire truck

This was not taken in Alaska but since it was spotted at CN’s barge slip in Prince Rupert I think it safe to presume it was headed to Alaska

My guess is that it has something to do with logging. A few loggers here on Vancouver Island converted Sherman tank chassis  into portable spar-trees. There is one on display at at the BC Forest Discovery Centre in Duncan, just south of here. As for what I presume were pontoons (stored on top) I can only guess that this thing was meant to be amphibious!.