An accessory mounting system suitable for mounting a plurality of accessories at a windshield portion within the interior cabin of a vehicle includes a housing adapted for releasable mounting to a receiving structure on the interior surface of the windshield of the vehicle, and at least two accessories housed by said housing. One of the accessories comprises a forwardly-viewing camera, which views through the windshield of the vehicle when said housing is mounted to said receiving structure. The other of the accessories may be selected from the group consisting of: (a) a vehicle altitude sensor, (b) a vehicle incline sensor, (c) a headlamp sensor, (d) a geographic positioning satellite (GPS) transmitter, (e) a geographic positioning satellite (GPS) receiver, (f) an antenna, (g) a rain sensor, (h) a microphone, and (i) a compass sensor.