Sometimes covering those types of things up just makes it worse...if some humidity gets in behind the garbage bags,and inevitably some will, it never really dries up properly and can make things rust faster. The bags will tear a bit from wind or whatever and some rain or snow will find its way in there...then on a warmer sunny day it will sweat...The same goes for covering a/c units. Our son in law is in the a/c business and has always told us best to leave it exposed so humidity doesn't get trapped under the cover, then just give it a good rinse with a garden hose in the spring...thats what we have done for years now.
2011 GMC Sierra 2500HD
2014 Rockwood 8289WS, Diamond Pkg.