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If you do not take Richard up on his offer than I would suggest checking out this video, it’s very informative and its now how I do all my alignments. 

https://youtu.be/m8OG17cW5r4?is=g9ncRsdOGGYZaVm8

This is the vintage of coach that could have early slack adjusters that were recalled. Not sure if Newell used them or not. Almost sounds like you may have uneven braking. The early auto slacks have an adjuster pawl that has to be removed before backing them off, folks do not know this and they force them and damage them. Also if they have not been serviced with the correct grease and or greased at all then they could be out of adjustment. 

Can someone confirm that these early Newells used ridewell suspension? If not, if you can get me pictures of the suspension I can tell if it’s ridewell or not. 

I think you need someone who knows old air brake systems t9 go through your coach and make sure they are all correct, then you can start to diagnose of it’s a brake issue or an alignment or worn suspension issue. Common for tag bushings to be worn out as well as panhard bar bushings on the drive axle. Both of these will cause issues but with your description of just a pull to the right it seems less likely these are the problem.