Hummer is a brand of sport utility vehicles (SUVs) sold by General Motors, also known as GM. They are based on the military High Mobility Multipurpose Wheeled Vehicle, or Humvee. The Hummer is one of the larger SUV types, with commensurate high fuel consumption.
The Hummer H1 is basically a HMMWV built for civilian use; it has no armor or weapons fittings. However, the drive-train, frame, body, suspension, etc., are exactly the same. The H1 differs from the HMMWV in having a civilian interior, including trim, comfortable seats, stereo, and air conditioning as standard options. As a result of its commercial use, features introduced in the civilian Hummer have been incorporated into improved military versions. The H1's electrical system is 12 volts, with the two batteries wired in parallel. The HMMWV runs on a 24V system, where the two batteries are run in series to generate 24 volts.
Since all Hummer vehicles have heavy-duty capabilities, they have been employed by owners for aid in large disaster situations. Hummer Owners Prepared for Emergencies (HOPE) was created by the efforts of The Hummer Club, INC. and the American Red Cross. Together, the two organizations train Hummer owners with CPR and First Aid skills, and basic off-highway skills so that they may assist victims during a disaster situation.
Today, more than 200 owners have undergone HOPE certification and many even assisted during the Hurricane Katrina disaster.
Many Hummer clubs have also developed local collaborations with law enforcement, fire, search and rescue and civil air patrol squadrons.