Even if you fly, hopefully your airline will do most of the footwork for you....
The corridor trails in Canada are very much like our Interstate Highways here in the states. Nice wide four and five lane limited access, meaning, one way traffic north, south, east and west. The signage on the trails let you know about Food, Lodging, Gas, hospital, parts and all of the major brand snowmobile dealerships, and much more.
On one of our trips to Gaspe on the ST. Lawrence Seaway, one of the sleds burned a piston. There was a dealership within 25 miles and we towed the sled in, it was under warranty and they not only did the repair work, but gave him a sled to use, we continued our trip and stopped on our way back through. His sled was ready, and we returned home safe and sound.
PS. Oh, and we had at least one good mechanic in our group.