Hi Gary.
Wow two coaches to do maintenance on. That'll eep a guy busy.
Well, you might be in luck. We used to own a 98 Pat. Monticello.
We also had the noise on left turn and found it to be the slightly larger tire size when Michelin went to the XA-2. That was just enough to make the outer most tread bead rub on the wheel well liner bolt heads. Since we have traded the coach, I have heard stories about insufficient pressure in air bags allowing more lean during a turn so I would verify that perhaps Gerald Ferris could add to that. I also noted that there was slightly more room in front of the tires than behind and wondered about moving the axle forward a bit.
If you have a brake hanging up there is a critical question. Have the 'caliper slide rails' ever been lubed? Most truck shops have no idea what they are. I actualy had to teach our local shop after observing the process at Coach Masters of Bend Or. and Beaver Coach Sales. When they finaly pulled ours apart, it appeared that they had never been done and the calipers would only move very slightly. They are supposed to slide in and apply perssure to the rotor and then release fully. If this doesnt work right the rotor will wear to a dime thickness and suddenly shatter. Usualy does it on the down hill side of a mountain. These should be cleaned and lubed every two years according to my old manual. I paid about $50 per wheel and gained power and mileage with no more drag.
Hope this helps
Keith