Having experienced tire problems on my TM I would definitely get a second spare wheel/tire if going to Alaska. You could have problems and get caught where you could not easily get tires and/or the price would be very steep.
If you buy a unit without the lift kit I would also install it. I did this on my 2004 3124KS and it is a very easy task.
I hope that you will keep us posted on your Alaska travels. It might encourage some of the rest of us to take such a trip.
The best to you on this adventure.
Bill
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