It is possible your grill is vibrating and bouncing in and out.
Open the "hood" and look around the edges on the RV side: Are there wear marks? I didn't hear any noise but after a few seasons the grill rubbing against the gelcoat started to wear through. I went to a local home improvement store and picked up some weather stripping (an idea from another thor forum member here). With the weather stripping in place the grill is held snugly against the front--no vibrations anymore.
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