I just bought my second ADCO Designer Series cover. The first one lasted a little over two and a half years before disintegrating. My rig looks brand spanking new as the cover took all the beating from the sun, rain, sandy wind and everything else. I highly recommend it, as I am also one of those people who doesn't have enough land or money to build a dedicated RV garage...
Oh, and I searched the internet until my fingers bled... the best price right now for that cover is RVWholesalers.com with free shipping. Ordered yesterday and it was delivered this afternoon.