Air Liquide runs this Mack on oxygen deliveries to various scientific establishments in the Halifax area. This is the first time I've been able to catch this one sitting still.
It appears that the giant "MACK" letters on the grille didn't appeal to someone, and have been removed. Looks okay too!
Eagle Transportation Services of Havelock, New Brunswick, specializes in refrigerated bulk cargoes. Their web site is under construction, but from it I can tell that their address is in Sussex, but their office is in Roachville. (And I thought that was somewhere else.)
Back in 1988 they were still calling themselves Liquid Air, and they were running this Western Star in company colours, although I believe it was operated by a contractor.