Gang,
I've seen numerous discussions about this "mud flap" on here. Many folks suggest removing it because of various reasons. Well, my thoughts are, 1, why do you think the factory installed them in the first place? 2, logically, they seem to be there for a reason and that is, even if you have mud/stone flaps directly behind each set of duals, there's still the large, full width one that will help deflect or stop, stones and more from exiting the back of the coach and, possibly damaging the toad.
3, I personally don't think it's an "advertising" thing. All the manufacturers advertise enough with the badging, moniquers, and more all over the outside, front and back of all their coaches. Other than a simple notification or, label of what kind of coach one is following, to me, it's no big deal. I think it's kind of classy myself but, again, it's only my opinion. One thing though, if it's ever damaged, it does cost quite a bit to replace it. I've looked my "Itasca" one up in the parts manual I have and it's not cheap. It hovers around $450 just for the polished aluminum plate. That does not include the rubber part.
I've read on here that it causes chips and problems with toad front end finishes. I'm kind of perplexed on just how that can happen. I mean, if you've got, (like we do on ours) mud flaps behind the duals which, should stop a very large percentage of stones being caught in the treads and released via centrifugal force, then, you've got another barrier, full width mud flap that is quite heavy and is not blowing in the breeze because it's so darn heavy and is hanging straight vertically at 65 mph, then it should catch any stones etc. that the dual mud flaps might miss. That's my thoughts anyway, yours may differ.
Scott
Scott and Karla SDFD RETIRED2004 Itasca Horizon, 36GD Slate Blue 330 CAT
2011 GMC Sierra 1500 Ext Cab 4x4 Toad
2008 Caliente Red LVL II GL 1800 Goldwing KI60ND