I have an ADCO cover on mine. Been on there for about 6 months now and has done an excellent job of keeping things clean. However, it is not waterproof. I'm not familiar with any waterproof brands and would be a little concerned about them. If they can keep water out, they can hold it in.
I forget what ADCO calls the fabric my cover is made of but it's soft cloth like material, dries fast and billows up when the wind blows. All that good airflow keeps things from getting moldy and prevents mildew.
It's been thru some good winds and hasn't been a problem. If you decide on an ADCO I'd give them a call to find out which cover you should order. Their web site doesn't always give the best fitting cover. I had to send the first one back because it wasn't tall enough. I ended up getting a cover for a toy hauler (at ADCO's suggestion) and that worked out just fine. Mine is warrantied for 2 years and if it lasts that long I'll be happy. With any luck I may get more out of it.
