I had a stereo system and alarm installed in the Hummer by M&C Audio in Portsmouth. The Alpine alarm includes a pager with 2 mile radius, impact and field disturbance sensors - the works!
The 8 speaker system includes 2 10" Dual Voice Coil subs, 2 full range 5.25" speakers , and up front in custom kick panel boxes are component mid and tweeters. All the speakers are Rockford Fosgate. The deck is a Sony ES 7850 single CD receiver. The amps are all Rockford as well; I fried one of them when doing a real deep water crossing, so I had to replace it - whoops!