Check to see if the present caulking is the grey butyl tape variety and if so, replace it with that type. It comes in a small roll, is gray in color. When you remove the old butyl tape, clean the area thoroughly and then apply the tape. The butyl will probably be black and dirty by now. You just gently press it (start at the bottom first) on so that it sticks, then place the cover over it and fasten down. Apply enough pressure so that the tape starts to "ooze" through edges. Trim off any excess butyl.
If the sealant is not butyl tape, I would use one of these sealants: Sikaflex Marine, 3M, or Geocel Proflex. Geocel is probably more readily available. Whatever you do use, DO NOT use silicone. When it comes times to re caulk and silicone has been used previously, the new silicone won't stick to the old stuff. Also, you will find that silicone is not all that easy to remove.
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2008 Cougar 5th Wheel 27RKS
2005 2500 GMC Duramax
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