RV Seller Network??

Have any of you heard of RV Seller Network? I listed my Infinity 3750 on Craigslist and about a week into the ad I received a call from someone at RV Seller Network who promised that for a $295 fee, they could market my rig, screen the people calling about the RV and filtering out the tire kickers. They can also handle taking in the payment and paying off the bank loan for you. I know this sounds like a scam, but it would be a great idea for a legitimate service to RV owners, but I just don't want to trust this.