Nice review, you've covered it really well. Good clear photos as well.
I agree with you about the tractor. It's odd having wheels in that environment, especially to tow a large trailer, but it's also a pretty cool design. I've bought most of the Arctic line as there's a lot of cool elements to it but as a MODer I haven't built any of them OOB.
I ended up modding the trator by adding an extra pair of wheels and an enclosed control cabin for the crane/drill (so it combined the function of the tracked drill from the base camp set).
Then I used left over parts from the mobile outpost, the tracked base camp vehicle and parts from the collection to build a tracked outpost.
Makes a little more sense to me. I've almost completed a tracked trailer/lab to go with it as well as a few other things. I plan to some time do a diorama for all these as I really like the line (though mining in the Arctic was a little bit of an odd choice).
Hope you don't mind me sharing these here.