We traveled all over the northern Rockies last summer, Idaho, Mt and BC. We have our bikes on a rack on the back of the toad. It rained, then sunny, then more rain. Every time it rained, the toad was so dirty I couldn't see out the window to park it, and the bikes fared no better. So the trick was to find a car wash to wash the toad and the bikes. (Found a nice car wash in Banff, BC, if you can believe it. They use hot water up there, eh?) I like the Roadbag idea, that would at least keep the crud off the bikes, is that what you've found? Is the bag hard to take off and on? I wouldn't worry about rear radiator airflow, as there must be some space between your roadbag and your coach.
We have a Kuat rack, and use the anti-rattle u bolts from Roadmaster to eliminate shake rattle and roll of the bikes.
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Bill, Kathi and Zorro; '05 Beaver Patriot Thunder
2012 Sunnybrook Harmony 21FBS (SQEZINN)
2007 Jeep Grand Cherokee Overland
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