Jerry,
We have never taken our caravan skiing but have been tempted until we looked into it. We ski twice a year and usually self-cater, so it was natural for us to consider the van option. To that end we visited a few sites close to ski resorts, including the one at Bour St Maurice. These sites tended to be in the valleys and get very little sunshine in the depth of winter. They struck as cold uninviting venues, unlike the sunny heights up out of the mists and the damp.
We then considered the 'savings' against our normal self drive and directly booked apartment. Additional ferry fares, additional fuel, two additional night stops en route, camp site fees, electicity charges, etc soon wiped out or radically reduced the 'savings' to the point whre there was no compettition with the comfort and convenience of a ski in ski out apartment.
If I were resident on the Continent and making regular trips for a few days at a time, I may feel differently.
Phil