I'm heading for Alaska in 2018 and have heard horror stories. I have the solid flap that goes all the way across the back and I have heard people take these off when traveling to Alaska, as they kick up more rocks on uneven roads that the prevent. When I went to Alaska I ended up cutting about 4 ins off my rear flaps because they dragged and kicked up stones on dirt roads. I also made a Protect a tow type covering along with screens over the headlights and radiator and a windshield cover for the tow car. The only thing that I found really helpful was the 4 in off the mud flap and the windshield cover. The protect a tow was a pain to put on, remove and store especially when it rained and was covered with mud, it was not needed on the paved road. The tow car windshield cover was easy to install and remove and did save my wind shield from stone thrown up by passing trucks.
Correct you will not want a full low hanging mudflap for Alaska.
We went in 2015 and were very happy with our GMC protected by Roadmaster Guardian Rock Guard with a piece of naugahyde material across the windshield tucked into the doors & wipers.
Some great ideas have been suggested.
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