Do all coaches with tag axles have a option to lift the tag ? If not, how would you know? If you are viewing coaches online. I would figure that if I was seeing a coach in person I would be able...
Well Newmars now are using Freight liner chassis which have the lift tag and you can also steer the rear to make turns a lot easier. Most of these are on high end coaches. They also have the Z - TRW comfort drive that some really like.
You might find some Newmars still using Spartan, but they had made the switch to Freight liner a few years back.