I am sorry it happened to you. Being Camper World, it wouldn't surprise me if they knowingly sold you a damaged RV. However, if the dealer took the TT in as a trade and were never told of the issue, they may not even know the patch is up there. They may never have been on the roof either.
When we traded in our Class C, the dealer do a pretty thorough inspection on the inside, but they didn't open the slides and they didn't get on the roof. They based the trade in value solely on what they saw on the inside.
When buying a used RV, even a new RV, you really should get on the roof before signing anything. The roof is the most important part to keep maintained. Most leaks come through the roof. I am not blaming or bashing you. The first 2 RVs we bought, I did not look on the roof. I wish I had with our Class C, because when I finally did get on the roof, I noticed a depression right behind the seam between the roof and the cabover. Water never leaking through that area, but I would have asked the dealer to fix it before buying.
Do you know what the patch is? Can it be removed? There is a good chance it could just be a tear in the roof membrane. Perhaps a tree branch fell on it or a branch rubbed on it while driving down the road. At least it is patched, hopefully properly. If
Eternabond was used, then using heat you can remove it to inspect the damage. If they used a caulk like sealant, it too can be removed with a dull scraper. Be careful not to tear the membrane while removing it.
No matter what you do DO NOT take it back to Camper World. Give them a bad remove or something like that, but DO NOT expect them to fix it. It will only make you even madder. If you don't want to do the work yourself, hire a mobile RV repair guy to come look at it. He/she will be quick and thorough. You can also ask him/her to just give a quick look over the entire RV to make sure there aren't any other undisclosed issues.
Two big lessons to learn, 1) NEVER deal with Camping World for anything (other than this message board). 2) ALWAYS do a thorough inspection of a used RV. Even a new RV should get a pretty good look over and let them repair anything before you take delivery. The dealer will work much quicker if the paperwork hasn't been signed yet.
-Michael
