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Old 12-26-2019, 08:30 PM   #15
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Without any wind tunnel test to lean on, I believe the big mud flap causes high pressure on the front side and right under it. The high pressure air bounces off of the ground causing loose debris to become airborne.

You get the same action from a yard blower pointed at the ground.

I also think the mudflap causes reduced fuel mileage as it too acts like a sail under the coach.
That is exactly what happens. I had stone chips over six feet above the road on my enclosed trailer. The flap gets the small stones airborne and the vacuum behind the coach lifts them higher till they hit what's following.
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Old 12-26-2019, 08:33 PM   #16
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That is exactly what happens. I had stone chips over six feet above the road on my enclosed trailer. The flap gets the small stones airborne and the vacuum behind the coach lifts them higher till they hit what's following.
I never follow a Motorhome with a full length mud flap.
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Old 12-26-2019, 08:37 PM   #17
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I have mud flaps behind the rear wheels, but I removed the ad flap four years ago. I tow a Jeep four down and after 70,000 miles of towing and two trips to Alaska, plus driving another 60,000 miles, I have only two rock chips which I think happened while driving. I made one trip with the ad flap that was all highway towing and found rocks under the wipers. If a person wants to keep the ad flap then they probably need a protective screen on the tow bar. I didnít want the extra work, so off came the ad flap. I originally heard of the problems with the full width flap on this forum.
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Old 01-01-2020, 06:58 PM   #18
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I found 3 or 4 rock chips after our first long trip with our new toad.

I then bought brush mudflaps on our class C. They spans the entire width of the RV, except where I trimmed it for the tow equipment. The brushes can be cut to desired length with tin snips. They cost about 80 bucks on Amazon. Instead of drilling holes in the bumper I bought several bumper bracket.

We are now about 2500 miles into our Christmas trip and so far no new damage. Toad is also mostly clean.
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