Although my Dogue has a great deal of energy...it's really in short bursts, as opposed to a long kind of stamina you might find in other breeds.
For example, we spent 2 1/2 hours in the park this morning, walking, hiking, with occasional play bouts of wrestling with a German Shepherd dog who is a friend. But along the way, he would just want to hang out on the grass and just chill out... It's not really "Go-go-go".
So, this is my experience with the breed; I don't know how long you would be skijoring for....short, fun trips, yeah they would probably love it. Long trips....maybe not so much.