This evening Company 6 was alerted on box 4K with Company 4 for a reported vehicle fire endangering a structure. Captain 6 arrived to find a motor home with fire inside the vehicle. Asst 6-1 forced the door and the Rescue crew advanced an 1 3/4 line and knocked the fire within seconds. Crews opened up and found a small fire outside of the bathroom with heat and smoke damage to the motor home. Tanker 6 supplied the Rescue, while Engine and Tanker 4 staged on the hard top. Company 6 was out for a little over an hour.