The Brockway 700 series, and 400 series Coe's had the same cabs that Mack used, but thats as far as it went is my understanding. There are some interesting photos out there of a prototype Brockway "Superliner" that never went into production. Theres a whole conspiracy theory out there about Mack not having any good new designs, they see the new Brockway prototype, Brockway workers go on strike, Mack sees an opportunity, Mack shuts down Brockway, Mack produces their new "Superliner"!