Actually, you do have a good point. I forgot that they do have wheel covers. Come to think of it, something like Fury 325 would benefit greatly from them.
I feel like coasters where the wheels are above the riders (such as Tatsu) would benefit greatly from these. I think Montu, Batman: The Ride (particularly the SFGAm one) and Nemesis would be perfect for these.
Timberliners are some of the best coaster trains when it comes to theming, with Oscar's Wacky Taxi and Switchback probably being the best out of them (in terms of train theming)
Another question, are Cedar Fair Halloween events generally better than Six Flags ones? Or are they on the same page? Granted it's nowhere near the level of Universal, but how comparable are they to one another?