You can get tyres in Osorno at Moto Adventura. Probably not knobbies though, but you don't really need it for the Carreterra. It's just a gravel road.
We looked at that crossing there, but heard from cyclists that crossed is it would be near impossible. They had little in terms of weight but struggled. Covered in mud to the knees and thighs, and you end up traversing mountain sides through all the trees. It's not impossible with a trail bike, but weather permitting and experience required.
There is a ferry to pick you up. Might need to ring ahead though. Should be to hard to organise.
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