That looks like the ones I have but I bought mine direct from the auto start stop eliminator website. One is on a 22 Wildtrak and the other on a 23 Wildtrack.
I have the U.S. version on two Broncos for almost two years now with no problems. I also had one on Wranglers with no problems. I have no idea how the eBay version performs but for $100 for the U.S. version why take a chance?
Don’t worry about it. I towed Explorers and Jeeps behind motorhomes for over 50k miles. It is very common and as grtharris said it is road crud and will burn off. A frequent question on Motorhome forums.
Just to clarify: The bags are new and never used. They are for all four doors and come with the harness for on board storage. $350 OBO and will discuss shipping if shipping cost is reasonable.