Our RV isn't a Fleetwood, but don't see any replies yet...
We surely will be in the minority once there are replies...yes, we cover the RV.
Why the minority? Just a quick look around our RV storage will show, folks do not use covers because Class A covers are big and heavy and difficult to install and remove. But the alternative is damage from the elements.
We install the cover anytime the RV will sit over 3-4 weeks without moving, because the sun is so intense in these parts that it will cook the finish and the soft parts (TPO roof, caulking, seals, etc.).
Having said that, covered storage IS BEST, but too expensive in SoCal for our wallet.
See here for what we found about covers:
http://www.irv2.com/forums/f121/i-lo...ml#post1309930
See here for pics of our 37' RV with the cover installed:
http://www.irv2.com/forums/f121/outl...ml#post1681530
Fitment is easy since the covers come in bands of lengths...just pick the size cover that is the same length or slightly longer than the RV.
Best luck