See where people lost a rear dully wheel simulator and trying get one for a replacement. What about the damaged air lines? Seems you have to buy an entire air line kit in order to replace one hose.
Replacing the air line is the least of it. If the departing wheel cover/simulator doesn't tear up enough of the air line and valve to deflate a tire or two, it'll flail around and damage the coachwork. Along the lines of a blowout and flailing tire tread. Friends should't let friends use Extenders. NO extenders and suffer, OR Tire-Man.