Possible difference in rim width or off set .
I just had tires installed , on my F/L chassis ( 8 bolt wheels ) and the Simulators were similar if not identical to my B-in-L's 05 Tiffin ; W-22 Workhorse . Can't check for certain , he no longer has the coach.
All 6 rims on your coach will be the same , so if removing a front cover is necessary to get the rim P/N , do what ever is easiest.
Info stamped in rim; close to the tire valve.
99DSDP 3884, Freightliner, XC, CAT 3126B, 300 HP /ALLISON 3060
2000 Caravan toad, Remco & Blue Ox.