Thanks for the confirmation of my suspicions. I have never had a vehicle with double belts on the steering pump, and wasn't sure if the extra tension and surface area of belt to pully would cause enough resistance to prevent me from turning the pully.
Guess I'll be driving the Suburban till I get the Benz fixed. It gets the same mileage, but costs a whole lot more to fill up.
73 280 SEL 4.5