National Highway Traffic Safety Administration (NHTSA): The NHTSA website provides information on vehicle safety recalls and safety ratings. You can enter the RV's VIN to check for any outstanding recalls.
Carfax: Carfax offers a free VIN check that provides information about a vehicle's history, including accidents, maintenance, and ownership history.
EpicVIN: EpicVIN provides a free VIN check that gives details about the vehicle's specifications and history.
VINCheck.info: VINCheck.info offers a free VIN check that includes information about the vehicle's title, accident history, and odometer readings.
It's worth noting that some free VIN check services may provide limited information compared to paid services or the official sources like the NHTSA. Always verify the accuracy of the information provided by comparing it with other sources and official records.