Should be a beautiful trip. It will be an awesome trip if you prepare for the cold and wet. Services are very limited on the Cassiar, and expensive when they can be found. Pretty much from White Horse in the north to Smithers on the south of the Cassiar you won't find many stores to restock on food. There's plenty of gas stations but I can't imagine eating out of a gas station's pantry (especially these gas stations...) for too long.