Mack Air Ride locking rears?

I'm looking at a 2001 Mack dump truck that has air ride on the tandems.

The owner seems pretty straightforward and he said when he has been off the road with the truck he has locked the rears and not had to get pulled out of anywhere.

He said that he thought that was an interaxle lock, not a full locking differential switch.

Does anyone know how the air ride is set up on those years of trucks?

Did the dump trucks come from the factory with fully locking rears?

I find it hard to believe Mack could build an air ride without full lockers, but I'm still learning about a lot of the things that Mack does.

 

These are original Mack Air Ride Rears.

They are genuine Mack rears.

Do you know if they come from the factory with lockers or not?

I always thought that all air ride dump trucks came with lockers from the factory.

 

Well that's good because he's hitting an air switch and he says it takes him everywhere it has to take him.

I'm a big fan of the Camelback and the Mack Rears.

I wasn't really looking for air ride but I'm not planning on going off the road much anyway and since it's genuine Mack that's probably better.

Hopefully the air ride will make it a comfortable ride, if I buy it.