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Because the journey to the Alps is longer than one driver may drive in a day. With two drivers they take turns, and the coach can keep going, at night as well.
As early as possible. In the spring half-term many Flemish schools and clubs leave for the snow at the same time, and coaches are quickly fully booked.
For a small group, usually yes. For a full coach with skis, snowboards and suitcases, the coach company often asks for a ski box or a trailer; so say in your request what is coming along.