The contact owned a 2021 Ford Explorer which was used to haul a 2002 Opus OP. The contact stated that while the vehicle was at the RV dealer for installations to be performed the vehicle caught on fire and was destroyed. The contact was informed after the installation of an electronic brake controller was completed the vehicle was parked and approximately 20 minutes later flames were present coming from the engine compartment. The fire department was called to the scene and extinguished the flames. The vehicle was destroyed. Prior to the incident an electric brake controller was installed in the vehicle and wired DC to DC in order to send a charge to the tow vehicle. The manufacturer was made aware of the failure and a case was opened. The fire department indicated that the fire originated in the engine compartment. A fire report was taken at the scene. The failure mileage was 3,807.