I got Ziggy to get me a Wolf brand cover from Summit a few years ago, Wolf does a specific 2G cover as well.
I have used this cover for about 6 years with no ill affects, the key to making sure it doesn't affect the car is to keep it clean. When you remove it and you see dust on the car off to the Laundromat it goes. We also have a classic Corvette with a pricy paint job and it has spent the last 8-9 years under a wolf cover as well.
No issues with affecting paint, moisture etc.