My grandfather hauled beer from Milwaukee and St. Louis to Nashville with a couple of those rigs (34 model) set up as tractor-trailers. Mechanical brakes on the tractors, and NO brakes on the trailers. Later they converted the tractors to vacuum boosters on the mechanical brake systems.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!