A question about your tire sizes and what pressures you're running.
Have you weighed the coach when loaded for travel , and adjusted tire pressures accordingly?
A Newmar recall , of 97>2000 , Dutch Star on Freightliner chassis issued in 2004 , to replace the underrated front tires on the coaches .
The recall was to change from 255/80R/22.5 , to 275/70R/22.5s on the front axle, the owner of my coach at the time had all 6 tires changed to the larger tires.
If some how your coach missed the recall and is still running on the smaller tire . That would be a place to start.
99DSDP 3884, Freightliner, XC, CAT 3126B, 300 HP /ALLISON 3060
2000 Caravan toad, Remco & Blue Ox.