I have both the Enkays and also a set of good mudflaps. Without the mudflaps there is still room for some projectiles to fly off the tires.
With mudflaps alone, there is also still the possibility of projectiles hitting the front of the RV. With both, I have been down many a gravel road and have net to have a rock ding from stones thrown up by the tires. Both the Enkay and the mudflaps have marks where mud and such have hit them both, but no the front of the trailer. I would suggest the combo to anyone out there.