They have a micro u joint that looks like it came out of a Neon. Mine is a stickshift, so I turned off the engine on a 25 mph winding mountain road (downhill) to get a feel for what it would be like if I lost the engine. As long as it was in gear, the transmission turns the engine, but when I pressed the clutch, I almost went into the ditch. That steering takes a lot of effort without assist, so I think they should have used a much larger joint.
OF course, I just let go of the clutch and instantly got my steering back.
I feel sorry for those with an auto and oversize tires. No power steering, and only one or two power assisted brakings if you lose the engine.
But losing the belt would be equally bad with a stickshift.
The smaller freightliners have an emergency hydraulic pump, to keep brakes (and steering ?) going without the engine.