Personally, I wouldn't use silicone. Once it starts to deteriorate, peel and discolour, it needs to be removed before applying any other kind of sealant. As mentioned above, nothing will stick to it so applying new silicone on top of old is a waste of time and money.
ProFlex caulk is a better choice and one that has better all round qualities than silicone. If you do recaulk, you'll have to remove all the old silicone and clean the area thoroughly before applying the new stuff.
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2008 Cougar 5th Wheel 27RKS
2005 2500 GMC Duramax
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