i'd be tempted to suck on the barrel before heading north again (to fort smith)...
how long are you planning on staying ?
fort smith is probably not a great choice if driving the boxster is important to ya, but you already know that.
i spent enough time in northern SASK, that i know the beauty of the north and the sacrifices needed in life style to survive. my family stayed in saskatoon. i commuted to site by air (points north landing)
we beat the everlovin snot out of every truck they handed to us at Mxxxxxn lake, 3 years was a good life for a vehicle in the north.
sell the boxster or store it, no sense in even thinking about anything nice or fancy north of 60. i've got a bmw f650 dakar for roads like that
post pictures when you get there, safe travel