orys:
And btw: what’s mud wing top?
Eh? I’ve no idea what else they might be called.
A mud wing is the moulded plastic shroud that goes over a wagons rear wheels, to stop mud and water being thrown up.
Many artic units have these things in 3 separate parts, so that the top part can be removed when pulling low trailers. It saves them from being ripped off by the trailer when turning on uneven ground.
As the whole thing is called a mud wing, where I come from anyway. The top, removable, section would be a mud wing top.
Hanging down from the rear section is a mud flap 