I'm not sure which manufacturers are not recommending RV covers, but I have seen owners manuals with "don't use a tarp!" warnings in them.
I cover mine over the winter with a ADCO cover. Since it's a 30' trailer, it's kind of a pain to put on by myself. My old 23' trailer was a lot easier due to the smaller size and weight of the cover.
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2013 Sunset Trail 29SS
2006 Ford F350 6.0 Diesel
ProPride 3P Hitch
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