[bikeprof]

Hmmm, big trucks loosing "their" brakes is not the trucks fault.
The operator behind the wheel is THE fault behind trucks "loosing" the brakes!

Been driving since 1977(large trucks), and have seen quite a few instances where trucks were in "runoff's" and that is a good feeling but at the same time, amount of dollars that someone had to pay for the extraction is/was what makes an impact to me...

1. Run off ramps ARE designed for the occasional reason of mechanical disparity
2. Run off ramps, there ALSO for the more often ERROR in driver/operator F__K UP, exits installed there hoping these will save lives(and they do!)
3. Brake pad/shoe mal-adjustment happens to be top three use of run off exits
4. SPEED, actually... OVERSPEED is also top three(hmmm, sure!?!?), hahahaha

But wheel covers, I would debate this.
More an excuse and blame to accuse others of driver error; UNLESS the wheel covers cover BOTH sides of wheel assembly(in n out), covering drum, not letting any air thru to cool stuff off. (these don't exist though...)