The Newfie ferry provides tie downs but you might want to bring some yourself depends on how anal you are about your bike, they have big loops in the deck to tie down to. The weather - depends - you could spend two extra days at sea because the ferry can't land because of a huge storm but the odds are well in your favour that you will have a smooth as glass crossing or maybe some thick fog!
One thing I do, as well as tying down I lock my front brake on with a small velcro loop around the grip
Cheers
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