My smoker lives on a covered porch, under its nice Smokin-It cover. I haven't had any problems with this method. I use mine way too often for spiders to build a house in it. ;D
Here's a link to my cover modification:
http://smokinitforums.com/index.php?topic=832.msg2247#msg2247
The stock cover is great, but it won't stay on the unit if there's any wind! I picked mine up out of the yard for the last time, so I devised a way to keep it secured to my smoker. Gotta work on getting this to be a factory standard!