Good question....
We have never used them and not really sure if they are needed.
I thought they were used primarily to shed water, but we always give a slight tilt to ours to do that anyway.
It will be interesting to hear from those that have or now use them and how well they are liked.
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06 King of the Road 37RLQS
06 Coachman Cross Country 5.9L 300HP 382 DS
03 Jeep Wrangler, 4.0L James, Trina, SMSgt, USAF Ret
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