This is not a cover of the song 'Tusk'. This is a cover of the ALBUM. A 20-some song double album, from back in the day where you weren't /nobody/ if you hadn't done an overly-pretentious self-worshipping doublealbum (ask Led Zeppelin about this one).
Listening to the Camper Van cover, I now wrestle the urge to pick up a copy of the original, for comparison's sake.