what about a small generator... I am sure on a trip like that, it would come in useful for other things as well.
I think I saw some of these guys on tv once, they had BIG tires and would run almost no air, but when they blew a bead, they used lighter fluid and a match to re-set bead since it was SO cold, it basically exploded onto the rim. Pretty cool to see, but I have heard of people dying trying it (not first hand heard of).
Hood louvers would be useless!